Implement region namespaces

worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/BukkitPlayer.java

@@ -24,6 +24,7 @@ import com.sk89q.worldedit.util.Location;
 import com.sk89q.worldedit.world.weather.WeatherType;
 import com.sk89q.worldedit.world.weather.WeatherTypes;
 import com.sk89q.worldguard.LocalPlayer;
+import com.sk89q.worldguard.WorldGuard;
 import io.papermc.lib.PaperLib;
 import org.bukkit.BanList.Type;
 import org.bukkit.Bukkit;
@@ -54,6 +55,16 @@ public class BukkitPlayer extends com.sk89q.worldedit.bukkit.BukkitPlayer implem
         return name;
     }
 
+    @Override
+    public String getDefaultNamespace() {
+        // TODO: Add a per player override
+        boolean useNamespaces = WorldGuard.getInstance().getPlatform().getGlobalStateManager().useNamespaces;
+        if (useNamespaces) {
+            return getUniqueId().toString();
+        }
+        return null;
+    }
+
     @Override
     public boolean hasGroup(String group) {
         return plugin.inGroup(getPlayer(), group);

worldguard-core/src/main/java/com/sk89q/worldguard/LocalPlayer.java

@@ -31,6 +31,29 @@ import java.util.List;
 
 public interface LocalPlayer extends Player, RegionAssociable {
 
+    /**
+     * Returns the default namespace for this player.
+     *
+     * @return the default namespace.
+     */
+    String getDefaultNamespace();
+
+    default boolean isDefaultNamespace(String otherNamespace) {
+        String namespace = getDefaultNamespace();
+        // If both are null, they're the same (the global)
+        if (namespace == null && otherNamespace == null) {
+            return true;
+        }
+
+        // If only one is null, they're a mismatch
+        if (namespace == null || otherNamespace == null) {
+            return false;
+        }
+
+        // Compare string equality
+        return namespace.equalsIgnoreCase(otherNamespace);
+    }
+
     /**
      * Returns true if this player is inside a group.
      * 

worldguard-core/src/main/java/com/sk89q/worldguard/commands/region/MemberCommands.java

@@ -32,6 +32,7 @@ import com.sk89q.worldguard.WorldGuard;
 import com.sk89q.worldguard.domains.DefaultDomain;
 import com.sk89q.worldguard.protection.managers.RegionManager;
 import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+import com.sk89q.worldguard.protection.regions.RegionIdentifier;
 import com.sk89q.worldguard.protection.util.DomainInputResolver;
 import com.sk89q.worldguard.protection.util.DomainInputResolver.UserLocatorPolicy;
 
@@ -50,13 +51,13 @@ public class MemberCommands extends RegionCommandsBase {
             flags = "nw:",
             desc = "Add a member to a region",
             min = 2)
-    public void addMember(CommandContext args, Actor sender) throws CommandException {
+    public void addMember(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
-        String id = args.getString(0);
         RegionManager manager = checkRegionManager(world);
-        ProtectedRegion region = checkExistingRegion(manager, id, true);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+        ProtectedRegion region = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!getPermissionModel(sender).mayAddMembers(region)) {
@@ -69,10 +70,11 @@ public class MemberCommands extends RegionCommandsBase {
         resolver.setLocatorPolicy(args.hasFlag('n') ? UserLocatorPolicy.NAME_ONLY : UserLocatorPolicy.UUID_ONLY);
 
 
-        final String description = String.format("Adding members to the region '%s' on '%s'", region.getId(), world.getName());
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Adding members to the region '%s' on '%s'", friendlyName, world.getName());
         AsyncCommandBuilder.wrap(resolver, sender)
                 .registerWithSupervisor(worldGuard.getSupervisor(), description)
-                .onSuccess(String.format("Region '%s' updated with new members.", region.getId()), region.getMembers()::addAll)
+                .onSuccess(String.format("Region '%s' updated with new members.", friendlyName), region.getMembers()::addAll)
                 .onFailure("Failed to add new members", worldGuard.getExceptionConverter())
                 .buildAndExec(worldGuard.getExecutorService());
     }
@@ -82,15 +84,14 @@ public class MemberCommands extends RegionCommandsBase {
             flags = "nw:",
             desc = "Add an owner to a region",
             min = 2)
-    public void addOwner(CommandContext args, Actor sender) throws CommandException {
+    public void addOwner(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
 
-        String id = args.getString(0);
-
         RegionManager manager = checkRegionManager(world);
-        ProtectedRegion region = checkExistingRegion(manager, id, true);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+        ProtectedRegion region = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!getPermissionModel(sender).mayAddOwners(region)) {
@@ -103,10 +104,11 @@ public class MemberCommands extends RegionCommandsBase {
         resolver.setLocatorPolicy(args.hasFlag('n') ? UserLocatorPolicy.NAME_ONLY : UserLocatorPolicy.UUID_ONLY);
 
 
-        final String description = String.format("Adding owners to the region '%s' on '%s'", region.getId(), world.getName());
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Adding owners to the region '%s' on '%s'", friendlyName, world.getName());
         AsyncCommandBuilder.wrap(checkedAddOwners(sender, manager, region, world, resolver), sender)
                 .registerWithSupervisor(worldGuard.getSupervisor(), description)
-                .onSuccess(String.format("Region '%s' updated with new owners.", region.getId()), region.getOwners()::addAll)
+                .onSuccess(String.format("Region '%s' updated with new owners.", friendlyName), region.getOwners()::addAll)
                 .onFailure("Failed to add new owners", worldGuard.getExceptionConverter())
                 .buildAndExec(worldGuard.getExecutorService());
     }
@@ -149,13 +151,13 @@ public class MemberCommands extends RegionCommandsBase {
             flags = "naw:",
             desc = "Remove an owner to a region",
             min = 1)
-    public void removeMember(CommandContext args, Actor sender) throws CommandException {
+    public void removeMember(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
-        String id = args.getString(0);
         RegionManager manager = checkRegionManager(world);
-        ProtectedRegion region = checkExistingRegion(manager, id, true);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+        ProtectedRegion region = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!getPermissionModel(sender).mayRemoveMembers(region)) {
@@ -178,11 +180,12 @@ public class MemberCommands extends RegionCommandsBase {
             callable = resolver;
         }
 
-        final String description = String.format("Removing members from the region '%s' on '%s'", region.getId(), world.getName());
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Removing members from the region '%s' on '%s'", friendlyName, world.getName());
         AsyncCommandBuilder.wrap(callable, sender)
                 .registerWithSupervisor(worldGuard.getSupervisor(), description)
                 .sendMessageAfterDelay("(Please wait... querying player names...)")
-                .onSuccess(String.format("Region '%s' updated with members removed.", region.getId()), region.getMembers()::removeAll)
+                .onSuccess(String.format("Region '%s' updated with members removed.", friendlyName), region.getMembers()::removeAll)
                 .onFailure("Failed to remove members", worldGuard.getExceptionConverter())
                 .buildAndExec(worldGuard.getExecutorService());
     }
@@ -192,13 +195,13 @@ public class MemberCommands extends RegionCommandsBase {
             flags = "naw:",
             desc = "Remove an owner to a region",
             min = 1)
-    public void removeOwner(CommandContext args, Actor sender) throws CommandException {
+    public void removeOwner(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
-        String id = args.getString(0);
         RegionManager manager = checkRegionManager(world);
-        ProtectedRegion region = checkExistingRegion(manager, id, true);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+        ProtectedRegion region = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!getPermissionModel(sender).mayRemoveOwners(region)) {
@@ -221,11 +224,12 @@ public class MemberCommands extends RegionCommandsBase {
             callable = resolver;
         }
 
-        final String description = String.format("Removing owners from the region '%s' on '%s'", region.getId(), world.getName());
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Removing owners from the region '%s' on '%s'", friendlyName, world.getName());
         AsyncCommandBuilder.wrap(callable, sender)
                 .registerWithSupervisor(worldGuard.getSupervisor(), description)
                 .sendMessageAfterDelay("(Please wait... querying player names...)")
-                .onSuccess(String.format("Region '%s' updated with owners removed.", region.getId()), region.getOwners()::removeAll)
+                .onSuccess(String.format("Region '%s' updated with owners removed.", friendlyName), region.getOwners()::removeAll)
                 .onFailure("Failed to remove owners", worldGuard.getExceptionConverter())
                 .buildAndExec(worldGuard.getExecutorService());
     }

worldguard-core/src/main/java/com/sk89q/worldguard/commands/region/RegionCommands.java

@@ -32,6 +32,7 @@ import com.sk89q.worldedit.command.util.AsyncCommandBuilder;
 import com.sk89q.worldedit.extension.platform.Actor;
 import com.sk89q.worldedit.extension.platform.Capability;
 import com.sk89q.worldedit.util.Location;
+import com.sk89q.worldedit.util.auth.AuthorizationException;
 import com.sk89q.worldedit.util.formatting.component.ErrorFormat;
 import com.sk89q.worldedit.util.formatting.component.LabelFormat;
 import com.sk89q.worldedit.util.formatting.component.SubtleFormat;
@@ -44,7 +45,6 @@ import com.sk89q.worldedit.util.formatting.text.format.TextDecoration;
 import com.sk89q.worldedit.world.World;
 import com.sk89q.worldguard.LocalPlayer;
 import com.sk89q.worldguard.WorldGuard;
-import com.sk89q.worldguard.commands.CommandUtils;
 import com.sk89q.worldguard.commands.task.RegionAdder;
 import com.sk89q.worldguard.commands.task.RegionLister;
 import com.sk89q.worldguard.commands.task.RegionManagerLoader;
@@ -68,11 +68,8 @@ import com.sk89q.worldguard.protection.managers.migration.MigrationException;
 import com.sk89q.worldguard.protection.managers.migration.UUIDMigration;
 import com.sk89q.worldguard.protection.managers.storage.DriverType;
 import com.sk89q.worldguard.protection.managers.storage.RegionDriver;
-import com.sk89q.worldguard.protection.regions.GlobalProtectedRegion;
+import com.sk89q.worldguard.protection.regions.*;
-import com.sk89q.worldguard.protection.regions.ProtectedPolygonalRegion;
-import com.sk89q.worldguard.protection.regions.ProtectedRegion;
 import com.sk89q.worldguard.protection.regions.ProtectedRegion.CircularInheritanceException;
-import com.sk89q.worldguard.protection.regions.RegionContainer;
 import com.sk89q.worldguard.protection.util.DomainInputResolver.UserLocatorPolicy;
 import com.sk89q.worldguard.session.Session;
 import com.sk89q.worldguard.util.Enums;
@@ -133,7 +130,7 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "ng",
              desc = "Defines a region",
              min = 1)
-    public void define(CommandContext args, Actor sender) throws CommandException {
+    public void define(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
         LocalPlayer player = worldGuard.checkPlayer(sender);
 
@@ -142,12 +139,12 @@ public final class RegionCommands extends RegionCommandsBase {
             throw new CommandPermissionsException();
         }
 
-        String id = checkRegionId(args.getString(0), false);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), false);
 
         World world = player.getWorld();
         RegionManager manager = checkRegionManager(world);
 
-        checkRegionDoesNotExist(manager, id, true);
+        checkRegionDoesNotExist(sender, manager, id, true);
 
         ProtectedRegion region;
 
@@ -160,17 +157,18 @@ public final class RegionCommands extends RegionCommandsBase {
         RegionAdder task = new RegionAdder(manager, region);
         task.addOwnersFromCommand(args, 2);
 
-        final String description = String.format("Adding region '%s'", region.getId());
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Adding region '%s'", friendlyName);
         AsyncCommandBuilder.wrap(task, sender)
                 .registerWithSupervisor(worldGuard.getSupervisor(), description)
                 .onSuccess((Component) null,
                         t -> {
-                            sender.print(String.format("A new region has been made named '%s'.", region.getId()));
+                            sender.print(String.format("A new region has been made named '%s'.", friendlyName));
                             warnAboutDimensions(sender, region);
                             informNewUser(sender, manager, region);
                             checkSpawnOverlap(sender, world, region);
                         })
-                .onFailure(String.format("Failed to add the region '%s'", region.getId()), worldGuard.getExceptionConverter())
+                .onFailure(String.format("Failed to add the region '%s'", friendlyName), worldGuard.getExceptionConverter())
                 .buildAndExec(worldGuard.getExecutorService());
     }
 
@@ -186,17 +184,17 @@ public final class RegionCommands extends RegionCommandsBase {
              desc = "Re-defines the shape of a region",
              flags = "g",
              min = 1, max = 1)
-    public void redefine(CommandContext args, Actor sender) throws CommandException {
+    public void redefine(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         LocalPlayer player = worldGuard.checkPlayer(sender);
 
-        String id = checkRegionId(args.getString(0), false);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), false);
 
         World world = player.getWorld();
         RegionManager manager = checkRegionManager(world);
 
-        ProtectedRegion existing = checkExistingRegion(manager, id, false);
+        ProtectedRegion existing = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!getPermissionModel(player).mayRedefine(existing)) {
@@ -215,18 +213,19 @@ public final class RegionCommands extends RegionCommandsBase {
 
         RegionAdder task = new RegionAdder(manager, region);
 
-        final String description = String.format("Updating region '%s'", region.getId());
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Updating region '%s'", friendlyName);
         AsyncCommandBuilder.wrap(task, sender)
                 .registerWithSupervisor(worldGuard.getSupervisor(), description)
                 .sendMessageAfterDelay("(Please wait... " + description + ")")
                 .onSuccess((Component) null,
                         t -> {
-                            player.print(String.format("Region '%s' has been updated with a new area.", region.getId()));
+                            player.print(String.format("Region '%s' has been updated with a new area.", friendlyName));
                             warnAboutDimensions(player, region);
                             informNewUser(player, manager, region);
                             checkSpawnOverlap(sender, world, region);
                         })
-                .onFailure(String.format("Failed to update the region '%s'", region.getId()), worldGuard.getExceptionConverter())
+                .onFailure(String.format("Failed to update the region '%s'", friendlyName), worldGuard.getExceptionConverter())
                 .buildAndExec(worldGuard.getExecutorService());
     }
 
@@ -244,7 +243,7 @@ public final class RegionCommands extends RegionCommandsBase {
              usage = "<id>",
              desc = "Claim a region",
              min = 1, max = 1)
-    public void claim(CommandContext args, Actor sender) throws CommandException {
+    public void claim(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         LocalPlayer player = worldGuard.checkPlayer(sender);
@@ -255,11 +254,11 @@ public final class RegionCommands extends RegionCommandsBase {
             throw new CommandPermissionsException();
         }
 
-        String id = checkRegionId(args.getString(0), false);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), false);
 
         RegionManager manager = checkRegionManager(player.getWorld());
 
-        checkRegionDoesNotExist(manager, id, false);
+        checkRegionDoesNotExist(sender, manager, id, false);
         ProtectedRegion region = checkRegionFromSelection(player, id);
 
         WorldConfiguration wcfg = WorldGuard.getInstance().getPlatform().getGlobalStateManager().get(player.getWorld());
@@ -321,11 +320,12 @@ public final class RegionCommands extends RegionCommandsBase {
         task.setLocatorPolicy(UserLocatorPolicy.UUID_ONLY);
         task.setOwnersInput(new String[]{player.getName()});
 
-        final String description = String.format("Claiming region '%s'", id);
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Claiming region '%s'", friendlyName);
         AsyncCommandBuilder.wrap(task, sender)
                 .registerWithSupervisor(WorldGuard.getInstance().getSupervisor(), description)
                 .sendMessageAfterDelay("(Please wait... " + description + ")")
-                .onSuccess(TextComponent.of(String.format("A new region has been claimed named '%s'.", id)), null)
+                .onSuccess(TextComponent.of(String.format("A new region has been claimed named '%s'.", friendlyName)), null)
                 .onFailure("Failed to claim region", WorldGuard.getInstance().getExceptionConverter())
                 .buildAndExec(WorldGuard.getInstance().getExecutorService());
     }
@@ -341,7 +341,7 @@ public final class RegionCommands extends RegionCommandsBase {
              usage = "[id]",
              desc = "Load a region as a WorldEdit selection",
              min = 0, max = 1)
-    public void select(CommandContext args, Actor sender) throws CommandException {
+    public void select(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         LocalPlayer player = worldGuard.checkPlayer(sender);
         RegionManager manager = checkRegionManager(player.getWorld());
         ProtectedRegion existing;
@@ -350,7 +350,8 @@ public final class RegionCommands extends RegionCommandsBase {
         if (args.argsLength() == 0) {
             existing = checkRegionStandingIn(manager, player, "/rg select %id%");
         } else {
-            existing = checkExistingRegion(manager, args.getString(0), false);
+            RegionIdentifier id = processRegionId(sender, args.getString(0), false);
+            existing = checkExistingRegion(sender, manager, id);
         }
 
         // Check permissions
@@ -374,7 +375,7 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "usw:",
              desc = "Get information about a region",
              min = 0, max = 1)
-    public void info(CommandContext args, Actor sender) throws CommandException {
+    public void info(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
@@ -392,7 +393,8 @@ public final class RegionCommands extends RegionCommandsBase {
             existing = checkRegionStandingIn(manager, (LocalPlayer) sender, true,
                     "/rg info -w \"" + world.getName() + "\" %id%" + (args.hasFlag('u') ? " -u" : "") + (args.hasFlag('s') ? " -s" : ""));
         } else { // Get region from the ID
-            existing = checkExistingRegion(manager, args.getString(0), true);
+            RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+            existing = checkExistingRegion(sender, manager, id);
         }
 
         // Check permissions
@@ -488,7 +490,7 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "g:w:eh:",
              desc = "Set flags",
              min = 2)
-    public void flag(CommandContext args, Actor sender) throws CommandException {
+    public void flag(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
@@ -508,13 +510,13 @@ public final class RegionCommands extends RegionCommandsBase {
 
         // Lookup the existing region
         RegionManager manager = checkRegionManager(world);
-        ProtectedRegion existing = checkExistingRegion(manager, args.getString(0), true);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+        ProtectedRegion existing = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!permModel.maySetFlag(existing)) {
             throw new CommandPermissionsException();
         }
-        String regionId = existing.getId();
 
         Flag<?> foundFlag = Flags.fuzzyMatchFlag(flagRegistry, flagName);
 
@@ -522,7 +524,7 @@ public final class RegionCommands extends RegionCommandsBase {
         // can use, and do nothing afterwards
         if (foundFlag == null) {
             AsyncCommandBuilder.wrap(new FlagListBuilder(flagRegistry, permModel, existing, world,
-                                                         regionId, sender, flagName), sender)
+                                                         id, sender, flagName), sender)
                     .registerWithSupervisor(WorldGuard.getInstance().getSupervisor(), "Flag list for invalid flag command.")
                     .onSuccess((Component) null, sender::print)
                     .onFailure((Component) null, WorldGuard.getInstance().getExceptionConverter())
@@ -579,7 +581,8 @@ public final class RegionCommands extends RegionCommandsBase {
             }
 
             if (!args.hasFlag('h')) {
-                sender.print("Region flag " + foundFlag.getName() + " set on '" + regionId + "' to '" + value + "'.");
+                String friendlyName = id.getDisplayName(sender);
+                sender.print("Region flag " + foundFlag.getName() + " set on '" + friendlyName + "' to '" + value + "'.");
             }
 
         // No value? Clear the flag, if -g isn't specified
@@ -594,7 +597,8 @@ public final class RegionCommands extends RegionCommandsBase {
             }
 
             if (!args.hasFlag('h')) {
-                sender.print("Region flag " + foundFlag.getName() + " removed from '" + regionId + "'. (Any -g(roups) were also removed.)");
+                String friendlyName = id.getDisplayName(sender);
+                sender.print("Region flag " + foundFlag.getName() + " removed from '" + friendlyName + "'. (Any -g(roups) were also removed.)");
             }
         }
 
@@ -630,7 +634,7 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "p:w:",
              desc = "View region flags",
              min = 0, max = 2)
-    public void flagHelper(CommandContext args, Actor sender) throws CommandException {
+    public void flagHelper(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         World world = checkWorld(args, sender, 'w'); // Get the world
 
         // Lookup the existing region
@@ -644,7 +648,8 @@ public final class RegionCommands extends RegionCommandsBase {
             region = checkRegionStandingIn(manager, (LocalPlayer) sender, true,
                     "/rg flags -w \"" + world.getName() + "\" %id%");
         } else { // Get region from the ID
-            region = checkExistingRegion(manager, args.getString(0), true);
+            RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+            region = checkExistingRegion(sender, manager, id);
         }
 
         final RegionPermissionModel perms = getPermissionModel(sender);
@@ -680,7 +685,7 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "w:",
              desc = "Set the priority of a region",
              min = 2, max = 2)
-    public void setPriority(CommandContext args, Actor sender) throws CommandException {
+    public void setPriority(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
@@ -688,7 +693,8 @@ public final class RegionCommands extends RegionCommandsBase {
 
         // Lookup the existing region
         RegionManager manager = checkRegionManager(world);
-        ProtectedRegion existing = checkExistingRegion(manager, args.getString(0), false);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), false);
+        ProtectedRegion existing = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!getPermissionModel(sender).maySetPriority(existing)) {
@@ -697,7 +703,8 @@ public final class RegionCommands extends RegionCommandsBase {
 
         existing.setPriority(priority);
 
-        sender.print("Priority of '" + existing.getId() + "' set to " + priority + " (higher numbers override).");
+        String friendlyName = id.getDisplayName(sender);
+        sender.print("Priority of '" + friendlyName + "' set to " + priority + " (higher numbers override).");
     }
 
     /**
@@ -712,7 +719,7 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "w:",
              desc = "Set the parent of a region",
              min = 1, max = 2)
-    public void setParent(CommandContext args, Actor sender) throws CommandException {
+    public void setParent(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
@@ -723,9 +730,11 @@ public final class RegionCommands extends RegionCommandsBase {
         RegionManager manager = checkRegionManager(world);
 
         // Get parent and child
-        child = checkExistingRegion(manager, args.getString(0), false);
+        RegionIdentifier childId = processRegionId(sender, args.getString(0), false);
+        child = checkExistingRegion(sender, manager, childId);
         if (args.argsLength() == 2) {
-            parent = checkExistingRegion(manager, args.getString(1), false);
+            RegionIdentifier parentId = processRegionId(sender, args.getString(1), false);
+            parent = checkExistingRegion(sender, manager, parentId);
         } else {
             parent = null;
         }
@@ -739,11 +748,15 @@ public final class RegionCommands extends RegionCommandsBase {
             child.setParent(parent);
         } catch (CircularInheritanceException e) {
             // Tell the user what's wrong
-            RegionPrintoutBuilder printout = new RegionPrintoutBuilder(world.getName(), parent, null, sender);
             assert parent != null;
-            printout.append(ErrorFormat.wrap("Uh oh! Setting '", parent.getId(), "' to be the parent of '", child.getId(),
+
+            String parentFriendlyName = parent.getIdentifier().getDisplayName(sender);
+            String childFriendlyName = childId.getDisplayName(sender);
+
+            RegionPrintoutBuilder printout = new RegionPrintoutBuilder(world.getName(), parent, null, sender);
+            printout.append(ErrorFormat.wrap("Uh oh! Setting '", parentFriendlyName, "' to be the parent of '", childFriendlyName,
                     "' would cause circular inheritance.")).newline();
-            printout.append(SubtleFormat.wrap("(Current inheritance on '", parent.getId(), "':")).newline();
+            printout.append(SubtleFormat.wrap("(Current inheritance on '", parentFriendlyName, "':")).newline();
             printout.appendParentTree(true);
             printout.append(SubtleFormat.wrap(")"));
             printout.send(sender);
@@ -751,8 +764,9 @@ public final class RegionCommands extends RegionCommandsBase {
         }
 
         // Tell the user the current inheritance
+        String childFriendlyName = childId.getDisplayName(sender);
         RegionPrintoutBuilder printout = new RegionPrintoutBuilder(world.getName(), child, null, sender);
-        printout.append(TextComponent.of("Inheritance set for region '" + child.getId() + "'.", TextColor.LIGHT_PURPLE));
+        printout.append(TextComponent.of("Inheritance set for region '" + childFriendlyName + "'.", TextColor.LIGHT_PURPLE));
         if (parent != null) {
             printout.newline();
             printout.append(SubtleFormat.wrap("(Current inheritance:")).newline();
@@ -776,7 +790,7 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "fuw:",
              desc = "Remove a region",
              min = 1, max = 1)
-    public void remove(CommandContext args, Actor sender) throws CommandException {
+    public void remove(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         warnAboutSaveFailures(sender);
 
         World world = checkWorld(args, sender, 'w'); // Get the world
@@ -785,7 +799,8 @@ public final class RegionCommands extends RegionCommandsBase {
 
         // Lookup the existing region
         RegionManager manager = checkRegionManager(world);
-        ProtectedRegion existing = checkExistingRegion(manager, args.getString(0), true);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+        ProtectedRegion existing = checkExistingRegion(sender, manager, id);
 
         // Check permissions
         if (!getPermissionModel(sender).mayDelete(existing)) {
@@ -802,12 +817,15 @@ public final class RegionCommands extends RegionCommandsBase {
             task.setRemovalStrategy(RemovalStrategy.UNSET_PARENT_IN_CHILDREN);
         }
 
-        final String description = String.format("Removing region '%s' in '%s'", existing.getId(), world.getName());
+        String friendlyName = id.getDisplayName(sender);
+        final String description = String.format("Removing region '%s' in '%s'", friendlyName, world.getName());
         AsyncCommandBuilder.wrap(task, sender)
                 .registerWithSupervisor(WorldGuard.getInstance().getSupervisor(), description)
                 .sendMessageAfterDelay("Please wait... removing region.")
                 .onSuccess((Component) null, removed -> sender.print(TextComponent.of(
-                        "Successfully removed " + removed.stream().map(ProtectedRegion::getId).collect(Collectors.joining(", ")) + ".",
+                        "Successfully removed " + removed.stream()
+                                .map((r) -> r.getIdentifier().getDisplayName(sender))
+                                .collect(Collectors.joining(", ")) + ".",
                         TextColor.LIGHT_PURPLE)))
                 .onFailure("Failed to remove region", WorldGuard.getInstance().getExceptionConverter())
                 .buildAndExec(WorldGuard.getInstance().getExecutorService());
@@ -842,10 +860,6 @@ public final class RegionCommands extends RegionCommandsBase {
         if (world != null) {
             RegionManager manager = checkRegionManager(world);
 
-            if (manager == null) {
-                throw new CommandException("No region manager exists for world '" + world.getName() + "'.");
-            }
-
             final String description = String.format("Loading region data for '%s'.", world.getName());
             AsyncCommandBuilder.wrap(new RegionManagerLoader(manager), sender)
                     .registerWithSupervisor(worldGuard.getSupervisor(), description)
@@ -902,10 +916,6 @@ public final class RegionCommands extends RegionCommandsBase {
         if (world != null) {
             RegionManager manager = checkRegionManager(world);
 
-            if (manager == null) {
-                throw new CommandException("No region manager exists for world '" + world.getName() + "'.");
-            }
-
             final String description = String.format("Saving region data for '%s'.", world.getName());
             AsyncCommandBuilder.wrap(new RegionManagerSaver(manager), sender)
                     .registerWithSupervisor(worldGuard.getSupervisor(), description)
@@ -1068,14 +1078,15 @@ public final class RegionCommands extends RegionCommandsBase {
              flags = "sw:",
              desc = "Teleports you to the location associated with the region.",
              min = 1, max = 1)
-    public void teleport(CommandContext args, Actor sender) throws CommandException {
+    public void teleport(CommandContext args, Actor sender) throws CommandException, AuthorizationException {
         LocalPlayer player = worldGuard.checkPlayer(sender);
         Location teleportLocation;
 
         // Lookup the existing region
         World world = checkWorld(args, player, 'w');
         RegionManager regionManager = checkRegionManager(world);
-        ProtectedRegion existing = checkExistingRegion(regionManager, args.getString(0), true);
+        RegionIdentifier id = processRegionId(sender, args.getString(0), true);
+        ProtectedRegion existing = checkExistingRegion(sender, regionManager, id);
 
         // Check permissions
         if (!getPermissionModel(player).mayTeleportTo(existing)) {
@@ -1098,9 +1109,10 @@ public final class RegionCommands extends RegionCommandsBase {
             }
         }
 
+        String friendlyName = id.getDisplayName(sender);
         player.teleport(teleportLocation,
-                "Teleported you to the region '" + existing.getId() + "'.",
+                "Teleported you to the region '" + friendlyName + "'.",
-                "Unable to teleport to region '" + existing.getId() + "'.");
+                "Unable to teleport to region '" + friendlyName + "'.");
     }
 
     @Command(aliases = {"toggle-bypass", "bypass"},
@@ -1123,12 +1135,12 @@ public final class RegionCommands extends RegionCommandsBase {
         private final RegionPermissionModel permModel;
         private final ProtectedRegion existing;
         private final World world;
-        private final String regionId;
+        private final RegionIdentifier regionId;
         private final Actor sender;
         private final String flagName;
 
         FlagListBuilder(FlagRegistry flagRegistry, RegionPermissionModel permModel, ProtectedRegion existing,
-                        World world, String regionId, Actor sender, String flagName) {
+                        World world, RegionIdentifier regionId, Actor sender, String flagName) {
             this.flagRegistry = flagRegistry;
             this.permModel = permModel;
             this.existing = existing;
@@ -1160,9 +1172,10 @@ public final class RegionCommands extends RegionCommandsBase {
             for (int i = 0; i < flagList.size(); i++) {
                 String flag = flagList.get(i);
 
+                String qualifiedName = regionId.getQualifiedName();
                 builder.append(TextComponent.of(flag, i % 2 == 0 ? TextColor.GRAY : TextColor.WHITE)
                         .hoverEvent(clickToSet).clickEvent(ClickEvent.of(ClickEvent.Action.SUGGEST_COMMAND,
-                                "/rg flag -w \"" + world.getName() + "\" " + regionId + " " + flag + " ")));
+                                "/rg flag -w \"" + world.getName() + "\" " + qualifiedName + " " + flag + " ")));
                 if (i < flagList.size() + 1) {
                     builder.append(TextComponent.of(", "));
                 }
@@ -1172,10 +1185,12 @@ public final class RegionCommands extends RegionCommandsBase {
                     .append(TextComponent.newline())
                     .append(builder.build());
             if (sender.isPlayer()) {
+                String friendlyName = regionId.getDisplayName(sender);
+                String qualifiedName = regionId.getQualifiedName();
                 return ret.append(TextComponent.of("Or use the command ", TextColor.LIGHT_PURPLE)
-                                .append(TextComponent.of("/rg flags " + regionId, TextColor.AQUA)
+                                .append(TextComponent.of("/rg flags " + friendlyName, TextColor.AQUA)
                                     .clickEvent(ClickEvent.of(ClickEvent.Action.RUN_COMMAND,
-                                        "/rg flags -w \"" + world.getName() + "\" " + regionId))));
+                                        "/rg flags -w \"" + world.getName() + "\" " + qualifiedName))));
             }
             return ret;
         }

worldguard-core/src/main/java/com/sk89q/worldguard/commands/region/RegionCommandsBase.java

@@ -33,13 +33,13 @@ import com.sk89q.worldedit.regions.Polygonal2DRegion;
 import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.regions.selector.CuboidRegionSelector;
 import com.sk89q.worldedit.regions.selector.Polygonal2DRegionSelector;
+import com.sk89q.worldedit.util.auth.AuthorizationException;
 import com.sk89q.worldedit.util.formatting.component.ErrorFormat;
 import com.sk89q.worldedit.util.formatting.component.SubtleFormat;
 import com.sk89q.worldedit.util.formatting.text.TextComponent;
 import com.sk89q.worldedit.util.formatting.text.event.ClickEvent;
 import com.sk89q.worldedit.util.formatting.text.event.HoverEvent;
 import com.sk89q.worldedit.util.formatting.text.format.TextColor;
-import com.sk89q.worldedit.util.formatting.text.format.TextDecoration;
 import com.sk89q.worldedit.world.World;
 import com.sk89q.worldguard.LocalPlayer;
 import com.sk89q.worldguard.WorldGuard;
@@ -49,13 +49,13 @@ import com.sk89q.worldguard.protection.flags.Flag;
 import com.sk89q.worldguard.protection.flags.FlagContext;
 import com.sk89q.worldguard.protection.flags.InvalidFlagFormat;
 import com.sk89q.worldguard.protection.managers.RegionManager;
-import com.sk89q.worldguard.protection.regions.GlobalProtectedRegion;
+import com.sk89q.worldguard.protection.regions.*;
-import com.sk89q.worldguard.protection.regions.ProtectedCuboidRegion;
+import com.sk89q.worldguard.util.profile.Profile;
-import com.sk89q.worldguard.protection.regions.ProtectedPolygonalRegion;
-import com.sk89q.worldguard.protection.regions.ProtectedRegion;
-import com.sk89q.worldguard.protection.regions.RegionContainer;
 
+import java.io.IOException;
+import java.util.Optional;
 import java.util.Set;
+import java.util.UUID;
 import java.util.stream.Collectors;
 
 class RegionCommandsBase {
@@ -77,9 +77,9 @@ class RegionCommandsBase {
      * Gets the world from the given flag, or falling back to the the current player
      * if the sender is a player, otherwise reporting an error.
      *
-     * @param args the arguments
+     * @param args   the arguments
      * @param sender the sender
-     * @param flag the flag (such as 'w')
+     * @param flag   the flag (such as 'w')
      * @return a world
      * @throws CommandException on error
      */
@@ -95,28 +95,190 @@ class RegionCommandsBase {
         }
     }
 
+    /**
+     * Validate a region name.
+     *
+     * @param name        the name
+     * @param allowGlobal whether __global__ is allowed
+     * @throws CommandException thrown on an error
+     */
+    protected static void checkName(String name, boolean allowGlobal) throws CommandException {
+        if (!RegionIdentifier.isValidName(name)) {
+            throw new CommandException(
+                    "The region name of '" + name + "' contains characters that are not allowed.");
+        }
+
+        if (!allowGlobal && name.equalsIgnoreCase("__global__")) { // Sorry, no global
+            throw new CommandException(
+                    "Sorry, you can't use __global__ here.");
+        }
+    }
+
     /**
      * Validate a region ID.
      *
-     * @param id the id
+     * @param id          the id
      * @param allowGlobal whether __global__ is allowed
      * @return the id given
      * @throws CommandException thrown on an error
      */
+    @Deprecated
     protected static String checkRegionId(String id, boolean allowGlobal) throws CommandException {
-        if (!ProtectedRegion.isValidId(id)) {
+        checkName(id, allowGlobal);
-            throw new CommandException(
-                    "The region name of '" + id + "' contains characters that are not allowed.");
-        }
-
-        if (!allowGlobal && id.equalsIgnoreCase("__global__")) { // Sorry, no global
-            throw new CommandException(
-                    "Sorry, you can't use __global__ here.");
-        }
-
         return id;
     }
 
+    /**
+     * Validate a region namespace.
+     *
+     * @param namespace the namespace name
+     * @throws CommandException thrown on an error
+     */
+    protected static void checkNamespace(String namespace) throws CommandException {
+        if (!RegionIdentifier.isValidNamespace(namespace)) {
+            throw new CommandException(
+                    "The region namespace of '" + namespace + "' contains characters that are not allowed.");
+        }
+    }
+
+    /**
+     * Get the unqualified name from a possibly qualified region identifier.
+     *
+     * @param id the unprocessed region identifier
+     * @return the unqualified name, or an empty string if not present
+     */
+    protected static String getUnqualifiedName(String id) {
+        int namespaceSeparatorIndex = id.lastIndexOf(':');
+        if (namespaceSeparatorIndex == -1) {
+            return id;
+        }
+
+        int unqualifiedNameStartIndex = namespaceSeparatorIndex + 1;
+        if (unqualifiedNameStartIndex == id.length()) {
+            return "";
+        }
+
+        return id.substring(unqualifiedNameStartIndex);
+    }
+
+    /**
+     * Get the namespace name from a possibly qualified region identifier.
+     *
+     * @param id the unprocessed region identifier
+     * @return an optional containing the namespace name, or an empty string if qualified,
+     * if not qualified, an empty optional is returned
+     */
+    protected static Optional<String> getNamespace(String id) {
+        int namespaceSeparatorIndex = id.lastIndexOf(':');
+        if (namespaceSeparatorIndex == -1) {
+            return Optional.empty();
+        }
+
+        return Optional.of(id.substring(0, namespaceSeparatorIndex));
+    }
+
+    private static class InvalidMacroException extends RuntimeException {
+        public InvalidMacroException(String message) {
+            super(message);
+        }
+    }
+
+    /***
+     * Expand macros in the namespace name.
+     *
+     * @param namespace the unexpanded namespace name
+     * @return the expanded namespace name
+     */
+    protected static String expandNamespace(String namespace) {
+        if (namespace.startsWith("#")) {
+            String playerName = namespace.substring(1);
+
+            try {
+                Profile profile = WorldGuard.getInstance().getProfileService().findByName(playerName);
+                if (profile != null) {
+                    return profile.getUniqueId().toString();
+                }
+            } catch (InterruptedException | IOException e) {
+                e.printStackTrace();
+            }
+
+            throw new InvalidMacroException("Macro unresolvable: " + namespace);
+        }
+
+        return namespace;
+    }
+
+    /**
+     * Get the macro expanded namespace name from a possibly qualified region identifier.
+     *
+     * @param id the unprocessed region identifier
+     * @return an optional containing the expanded namespace name, or an empty string if qualified,
+     * if not qualified, an empty optional is returned
+     */
+    protected static Optional<String> getExpandedNamespace(String id) throws CommandException {
+        try {
+            return getNamespace(id).map(RegionCommandsBase::expandNamespace);
+        } catch (InvalidMacroException ex) {
+            throw new CommandException(ex.getMessage());
+        }
+    }
+
+    /**
+     * Get the default namespace for a given actor.
+     *
+     * @param sender the sender who's default namespace we intend to retrieve.
+     * @return the default namespace
+     */
+    protected static String getDefaultNamespace(Actor sender) {
+        if (sender instanceof LocalPlayer) {
+            return ((LocalPlayer) sender).getDefaultNamespace();
+        }
+
+        return null;
+    }
+
+    /**
+     * Process a possibly qualified region identifier into a RegionIdentifier.
+     *
+     * This method takes a possibly qualified region identifier, and processes it, expanding any namespace macros,
+     * running permissions checks, and validating the names for invalid character.
+     *
+     * @param sender the contextual sender to use for checks and macro expansions
+     * @param id the possibly unqualified id
+     * @param allowGlobal whether or not this method should allow use of the name __global__ name
+     * @return the processed region id
+     * @throws AuthorizationException if a permission check fails
+     * @throws CommandException if a name validation check fails
+     */
+    protected static RegionIdentifier processRegionId(Actor sender, String id, boolean allowGlobal) throws AuthorizationException, CommandException {
+        String unqualifiedName = getUnqualifiedName(id);
+        checkName(unqualifiedName, allowGlobal);
+
+        Optional<String> optProvidedNamespace = getExpandedNamespace(id);
+        String namespace = optProvidedNamespace.orElse(getDefaultNamespace(sender));
+
+        // TODO use more informative permission checks
+
+        // This needs checked as a special case, before namespace name validation.
+        if (namespace.equals("")) {
+            sender.checkPermission("worldguard.region.namespace.global");
+            return new RegionIdentifier(null, unqualifiedName);
+        }
+
+        checkNamespace(namespace);
+
+        try {
+            UUID namespacePlayerId = UUID.fromString(namespace);
+            if (!namespacePlayerId.equals(sender.getUniqueId())) {
+                sender.checkPermission("worldguard.region.namespace.player");
+            }
+        } catch (IllegalArgumentException ex) {
+            sender.checkPermission("worldguard.region.namespace.custom." + namespace);
+        }
+
+        return new RegionIdentifier(namespace, unqualifiedName);
+    }
+
     /**
      * Get a protected region by a given name, otherwise throw a
      * {@link CommandException}.
@@ -128,6 +290,7 @@ class RegionCommandsBase {
      * @param allowGlobal true to allow selecting __global__
      * @throws CommandException thrown if no region is found by the given name
      */
+    @Deprecated
     protected static ProtectedRegion checkExistingRegion(RegionManager regionManager, String id, boolean allowGlobal) throws CommandException {
         // Validate the id
         checkRegionId(id, allowGlobal);
@@ -150,6 +313,36 @@ class RegionCommandsBase {
         return region;
     }
 
+    /**
+     * Get a protected region by a given name, otherwise throw a
+     * {@link CommandException}.
+     *
+     * <p>This also validates the region ID.</p>
+     *
+     * @param actor the associated player
+     * @param regionManager the region manager
+     * @param id the name to search
+     * @throws CommandException thrown if no region is found by the given name
+     */
+    protected static ProtectedRegion checkExistingRegion(Actor actor, RegionManager regionManager, RegionIdentifier id) throws CommandException {
+        ProtectedRegion region = regionManager.getRegion(id);
+
+        // No region found!
+        if (region == null) {
+            // But we want a __global__, so let's create one
+            if (id.getQualifiedName().equals(":__global__")) {
+                region = new GlobalProtectedRegion(id);
+                regionManager.addRegion(region);
+                return region;
+            }
+
+            throw new CommandException(
+                    "No region could be found with the name of '" + id.getDisplayName(actor) + "'.");
+        }
+
+        return region;
+    }
+
 
     /**
      * Get the region at the player's location, if possible.
@@ -204,10 +397,12 @@ class RegionCommandsBase {
                     builder.append(TextComponent.of(", "));
                 }
                 first = false;
-                TextComponent regionComp = TextComponent.of(region.getId(), TextColor.AQUA);
+
+                RegionIdentifier id = region.getIdentifier();
+                TextComponent regionComp = TextComponent.of(id.getDisplayName(player), TextColor.AQUA);
                 if (rgCmd != null && rgCmd.contains("%id%")) {
                     regionComp = regionComp.hoverEvent(HoverEvent.of(HoverEvent.Action.SHOW_TEXT, TextComponent.of("Click to pick this region")))
-                            .clickEvent(ClickEvent.of(ClickEvent.Action.RUN_COMMAND, rgCmd.replace("%id%", region.getId())));
+                            .clickEvent(ClickEvent.of(ClickEvent.Action.RUN_COMMAND, rgCmd.replace("%id%", id.getQualifiedName())));
                 }
                 builder.append(regionComp);
             }
@@ -244,10 +439,23 @@ class RegionCommandsBase {
      * @param id the ID
      * @throws CommandException thrown if the ID already exists
      */
+    @Deprecated
     protected static void checkRegionDoesNotExist(RegionManager manager, String id, boolean mayRedefine) throws CommandException {
+        checkRegionDoesNotExist(null, manager, new RegionIdentifier(id), mayRedefine);
+    }
+
+    /**
+     * Check that a region with the given ID does not already exist.
+     *
+     * @param actor the associated player
+     * @param manager the manager
+     * @param id the identifier
+     * @throws CommandException thrown if the ID already exists
+     */
+    protected static void checkRegionDoesNotExist(Actor actor, RegionManager manager, RegionIdentifier id, boolean mayRedefine) throws CommandException {
         if (manager.hasRegion(id)) {
             throw new CommandException("A region with that name already exists. Please choose another name." +
-                    (mayRedefine ? " To change the shape, use /region redefine " + id + "." : ""));
+                    (mayRedefine ? " To change the shape, use /region redefine " + id.getDisplayName(actor) + "." : ""));
         }
     }
 
@@ -280,7 +488,20 @@ class RegionCommandsBase {
      * @return a new region
      * @throws CommandException thrown on an error
      */
+    @Deprecated
     protected static ProtectedRegion checkRegionFromSelection(LocalPlayer player, String id) throws CommandException {
+        return checkRegionFromSelection(player, new RegionIdentifier(id));
+    }
+
+    /**
+     * Create a {@link ProtectedRegion} from the player's selection.
+     *
+     * @param player the player
+     * @param id the identifier of the new region
+     * @return a new region
+     * @throws CommandException thrown on an error
+     */
+    protected static ProtectedRegion checkRegionFromSelection(LocalPlayer player, RegionIdentifier id) throws CommandException {
         Region selection = checkSelection(player);
 
         // Detect the type of region from WorldEdit

worldguard-core/src/main/java/com/sk89q/worldguard/commands/region/RegionPrintoutBuilder.java

@@ -19,6 +19,7 @@
 
 package com.sk89q.worldguard.commands.region;
 
+import com.sk89q.worldguard.protection.regions.RegionIdentifier;
 import com.sk89q.worldguard.util.profile.cache.ProfileCache;
 import com.sk89q.worldedit.extension.platform.Actor;
 import com.sk89q.worldedit.math.BlockVector3;
@@ -58,6 +59,7 @@ public class RegionPrintoutBuilder implements Callable<TextComponent> {
     @Nullable
     private final ProfileCache cache;
     private final TextComponentProducer builder = new TextComponentProducer();
+    private final Actor actor;
     private final RegionPermissionModel perms;
 
     /**
@@ -70,6 +72,7 @@ public class RegionPrintoutBuilder implements Callable<TextComponent> {
         this.world = world;
         this.region = region;
         this.cache = cache;
+        this.actor = actor;
         this.perms = actor != null && actor.isPlayer() ? new RegionPermissionModel(actor) : null;
     }
 
@@ -85,8 +88,10 @@ public class RegionPrintoutBuilder implements Callable<TextComponent> {
      */
     public void appendBasics() {
         builder.append(TextComponent.of("Region: ", TextColor.BLUE));
-        builder.append(TextComponent.of(region.getId(), TextColor.YELLOW)
+
-                .clickEvent(ClickEvent.of(ClickEvent.Action.RUN_COMMAND, "/rg info -w \"" + world + "\" " + region.getId())));
+        RegionIdentifier id = region.getIdentifier();
+        builder.append(TextComponent.of(id.getDisplayName(actor), TextColor.YELLOW)
+                .clickEvent(ClickEvent.of(ClickEvent.Action.RUN_COMMAND, "/rg info -w \"" + world + "\" " + id.getQualifiedName())));
         
         builder.append(TextComponent.of(" (type=", TextColor.GRAY));
         builder.append(TextComponent.of(region.getType().getName()));

worldguard-core/src/main/java/com/sk89q/worldguard/config/ConfigurationManager.java

@@ -76,6 +76,7 @@ public abstract class ConfigurationManager {
     public boolean migrateRegionsToUuid;
     public boolean keepUnresolvedNames;
     public boolean particleEffects;
+    public boolean useNamespaces;
 
     @Unreported public Map<String, String> hostKeys = new HashMap<>();
     public boolean hostKeysAllowFMLClients;

worldguard-core/src/main/java/com/sk89q/worldguard/config/YamlConfigurationManager.java

@@ -63,6 +63,7 @@ public abstract class YamlConfigurationManager extends ConfigurationManager {
         usePlayerMove = config.getBoolean("use-player-move-event", true);
         usePlayerTeleports = config.getBoolean("use-player-teleports", true);
         particleEffects = config.getBoolean("use-particle-effects", true);
+        useNamespaces = config.getBoolean("use-namespaces", true);
 
         deopOnJoin = config.getBoolean("security.deop-everyone-on-join", false);
         blockInGameOp = config.getBoolean("security.block-in-game-op-command", false);

worldguard-core/src/main/java/com/sk89q/worldguard/internal/permission/RegionPermissionModel.java

@@ -26,6 +26,7 @@ import com.sk89q.worldguard.LocalPlayer;
 import com.sk89q.worldguard.WorldGuard;
 import com.sk89q.worldguard.protection.flags.Flag;
 import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+import com.sk89q.worldguard.protection.regions.RegionIdentifier;
 
 import javax.annotation.Nullable;
 

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/RegionManager.java

@@ -34,6 +34,7 @@ import com.sk89q.worldguard.protection.managers.storage.DifferenceSaveException;
 import com.sk89q.worldguard.protection.managers.storage.RegionDatabase;
 import com.sk89q.worldguard.protection.managers.storage.StorageException;
 import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+import com.sk89q.worldguard.protection.regions.RegionIdentifier;
 import com.sk89q.worldguard.protection.util.RegionCollectionConsumer;
 import com.sk89q.worldguard.util.Normal;
 
@@ -242,10 +243,22 @@ public final class RegionManager {
      * @param id the name of the region
      * @return true if this index contains the region
      */
+    @Deprecated
     public boolean hasRegion(String id) {
         return index.contains(id);
     }
 
+    /**
+     * Return whether the index contains a region with the given identifier,
+     * with quality determined by {@link Normal}.
+     *
+     * @param id the region identifier
+     * @return true if this index contains the region
+     */
+    public boolean hasRegion(RegionIdentifier id) {
+        return index.contains(id.getLegacyQualifiedName());
+    }
+
     /**
      * Get the region named by the given name (equality determined using
      * {@link Normal}).
@@ -254,11 +267,24 @@ public final class RegionManager {
      * @return a region or {@code null}
      */
     @Nullable
+    @Deprecated
     public ProtectedRegion getRegion(String id) {
         checkNotNull(id);
         return index.get(id);
     }
 
+    /**
+     * Get the region named y the given id.
+     *
+     * @param id the region identifier
+     * @return a region or {@code null}
+     */
+    @Nullable
+    public ProtectedRegion getRegion(RegionIdentifier id) {
+        checkNotNull(id);
+        return index.get(id.getLegacyQualifiedName());
+    }
+
     /**
      * @deprecated Use exact ids with {@link #getRegion}
      */

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/index/HashMapIndex.java

@@ -70,12 +70,13 @@ public class HashMapIndex extends AbstractRegionIndex implements ConcurrentRegio
         region.setDirty(true);
 
         synchronized (lock) {
-            String normalId = normalize(region.getId());
+            String newFullId = region.getIdentifier().getLegacyQualifiedName();
+            String normalId = normalize(newFullId);
 
             ProtectedRegion existing = regions.get(normalId);
 
             // Casing / form of ID has changed
-            if (existing != null && !existing.getId().equals(region.getId())) {
+            if (existing != null && !existing.getIdentifier().getLegacyQualifiedName().equals(newFullId)) {
                 removed.add(existing);
             }
 

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/storage/file/DomainParser.java

@@ -0,0 +1,60 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.managers.storage.file;
+
+import com.sk89q.util.yaml.YAMLNode;
+import com.sk89q.worldguard.domains.DefaultDomain;
+
+import java.util.UUID;
+import java.util.logging.Level;
+
+class DomainParser {
+    public static class One {
+        public static DefaultDomain parseDomain(YAMLNode node) {
+            if (node == null) {
+                return new DefaultDomain();
+            }
+
+            DefaultDomain domain = new DefaultDomain();
+
+            for (String name : node.getStringList("players", null)) {
+                if (!name.isEmpty()) {
+                    domain.addPlayer(name);
+                }
+            }
+
+            for (String stringId : node.getStringList("unique-ids", null)) {
+                try {
+                    domain.addPlayer(UUID.fromString(stringId));
+                } catch (IllegalArgumentException e) {
+                    YamlCommon.log.log(Level.WARNING, "Failed to parse UUID '" + stringId + "'", e);
+                }
+            }
+
+            for (String name : node.getStringList("groups", null)) {
+                if (!name.isEmpty()) {
+                    domain.addGroup(name);
+                }
+            }
+
+            return domain;
+        }
+    }
+}

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/storage/file/FlagParser.java

@@ -0,0 +1,34 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.managers.storage.file;
+
+import com.sk89q.util.yaml.YAMLNode;
+import com.sk89q.worldguard.protection.flags.registry.FlagRegistry;
+import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+
+class FlagParser {
+    public static class One {
+        public static void setFlags(FlagRegistry flagRegistry, ProtectedRegion region, YAMLNode flagsData) {
+            if (flagsData != null) {
+                region.setFlags(flagRegistry.unmarshal(flagsData.getMap(), true));
+            }
+        }
+    }
+}

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/storage/file/YamlCommon.java

@@ -0,0 +1,59 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.managers.storage.file;
+
+import org.yaml.snakeyaml.DumperOptions;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.SafeConstructor;
+import org.yaml.snakeyaml.representer.Representer;
+
+import java.util.logging.Logger;
+
+class YamlCommon {
+    public static final Logger log = Logger.getLogger(YamlRegionFile.class.getCanonicalName());
+    public static final Yaml ERROR_DUMP_YAML;
+
+    static {
+        DumperOptions options = new DumperOptions();
+        options.setIndent(4);
+        options.setDefaultFlowStyle(DumperOptions.FlowStyle.AUTO);
+
+        ERROR_DUMP_YAML = new Yaml(new SafeConstructor(), new Representer(), options);
+    }
+
+    public static final String YAML_GLOBAL_NAMESPACE_NAME = "__global_ns__";
+
+    private YamlCommon() {
+    }
+
+    /**
+     * Dump the given object as YAML for debugging purposes.
+     *
+     * @param object the object
+     * @return the YAML string or an error string if dumping fals
+     */
+    public static String toYamlOutput(Object object) {
+        try {
+            return ERROR_DUMP_YAML.dump(object).replaceAll("(?m)^", "\t");
+        } catch (Throwable t) {
+            return "<error while dumping object>";
+        }
+    }
+}

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/storage/file/YamlReader.java

@@ -0,0 +1,34 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.managers.storage.file;
+
+import com.sk89q.util.yaml.YAMLProcessor;
+import com.sk89q.worldguard.protection.flags.registry.FlagRegistry;
+import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+
+import java.util.Set;
+
+interface YamlReader {
+    public int getVersion();
+    default public boolean canLoad(YAMLProcessor config) {
+        return config.getInt("version", 1) == getVersion();
+    }
+    public Set<ProtectedRegion> load(FlagRegistry flagRegistry, YAMLProcessor config);
+}

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/storage/file/YamlReaderVersionOne.java

@@ -0,0 +1,114 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.managers.storage.file;
+
+import com.sk89q.util.yaml.YAMLNode;
+import com.sk89q.util.yaml.YAMLProcessor;
+import com.sk89q.worldedit.math.BlockVector2;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.math.Vector3;
+import com.sk89q.worldguard.protection.flags.registry.FlagRegistry;
+import com.sk89q.worldguard.protection.managers.storage.RegionDatabaseUtils;
+import com.sk89q.worldguard.protection.regions.GlobalProtectedRegion;
+import com.sk89q.worldguard.protection.regions.ProtectedCuboidRegion;
+import com.sk89q.worldguard.protection.regions.ProtectedPolygonalRegion;
+import com.sk89q.worldguard.protection.regions.ProtectedRegion;
+
+import java.util.*;
+import java.util.logging.Level;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.sk89q.worldguard.protection.managers.storage.file.YamlCommon.log;
+import static com.sk89q.worldguard.protection.managers.storage.file.YamlCommon.toYamlOutput;
+
+class YamlReaderVersionOne implements YamlReader {
+    @Override
+    public int getVersion() {
+        return 1;
+    }
+
+    @Override
+    public Set<ProtectedRegion> load(FlagRegistry flagRegistry, YAMLProcessor config) {
+        Map<String, ProtectedRegion> loaded = new HashMap<>();
+        Map<String, YAMLNode> regionData = config.getNodes("regions");
+
+        if (regionData == null) {
+            return Collections.emptySet(); // No regions are even configured
+        }
+
+        Map<ProtectedRegion, String> parentSets = new LinkedHashMap<>();
+
+        for (Map.Entry<String, YAMLNode> entry : regionData.entrySet()) {
+            String id = entry.getKey();
+            YAMLNode node = entry.getValue();
+
+            String type = node.getString("type");
+            ProtectedRegion region;
+
+            try {
+                if (type == null) {
+                    log.warning("Undefined region type for region '" + id + "'!\n" +
+                            "Here is what the region data looks like:\n\n" + toYamlOutput(entry.getValue().getMap()) + "\n");
+                    continue;
+                } else if (type.equals("cuboid")) {
+                    Vector3 pt1 = checkNotNull(node.getVector("min"));
+                    Vector3 pt2 = checkNotNull(node.getVector("max"));
+                    BlockVector3 min = pt1.getMinimum(pt2).toBlockPoint();
+                    BlockVector3 max = pt1.getMaximum(pt2).toBlockPoint();
+                    region = new ProtectedCuboidRegion(id, min, max);
+                } else if (type.equals("poly2d")) {
+                    Integer minY = checkNotNull(node.getInt("min-y"));
+                    Integer maxY = checkNotNull(node.getInt("max-y"));
+                    List<BlockVector2> points = node.getBlockVector2List("points", null);
+                    region = new ProtectedPolygonalRegion(id, points, minY, maxY);
+                } else if (type.equals("global")) {
+                    region = new GlobalProtectedRegion(id);
+                } else {
+                    log.warning("Unknown region type for region '" + id + "'!\n" +
+                            "Here is what the region data looks like:\n\n" + toYamlOutput(entry.getValue().getMap()) + "\n");
+                    continue;
+                }
+
+                Integer priority = checkNotNull(node.getInt("priority"));
+                region.setPriority(priority);
+                FlagParser.One.setFlags(flagRegistry, region, node.getNode("flags"));
+                region.setOwners(DomainParser.One.parseDomain(node.getNode("owners")));
+                region.setMembers(DomainParser.One.parseDomain(node.getNode("members")));
+
+                loaded.put(id, region);
+
+                String parentId = node.getString("parent");
+                if (parentId != null) {
+                    parentSets.put(region, parentId);
+                }
+            } catch (NullPointerException e) {
+                log.log(Level.WARNING,
+                        "Unexpected NullPointerException encountered during parsing for the region '" + id + "'!\n" +
+                                "Here is what the region data looks like:\n\n" + toYamlOutput(entry.getValue().getMap()) +
+                                "\n\nNote: This region will disappear as a result!", e);
+            }
+        }
+
+        // Relink parents
+        RegionDatabaseUtils.relinkParents(loaded, parentSets);
+
+        return new HashSet<>(loaded.values());
+    }
+}

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/storage/file/YamlReaderVersionTwo.java

@@ -0,0 +1,120 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.managers.storage.file;
+
+import com.sk89q.util.yaml.YAMLNode;
+import com.sk89q.util.yaml.YAMLProcessor;
+import com.sk89q.worldedit.math.BlockVector2;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.math.Vector3;
+import com.sk89q.worldguard.protection.flags.registry.FlagRegistry;
+import com.sk89q.worldguard.protection.managers.storage.RegionDatabaseUtils;
+import com.sk89q.worldguard.protection.regions.*;
+
+import java.util.*;
+import java.util.logging.Level;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.sk89q.worldguard.protection.managers.storage.file.YamlCommon.*;
+
+class YamlReaderVersionTwo implements YamlReader {
+    @Override
+    public int getVersion() {
+        return 2;
+    }
+
+    @Override
+    public Set<ProtectedRegion> load(FlagRegistry flagRegistry, YAMLProcessor config) {
+        Map<String, ProtectedRegion> loaded = new HashMap<>();
+        Map<String, YAMLNode> regionData = config.getNodes("regions");
+
+        if (regionData == null) {
+            return Collections.emptySet(); // No regions are even configured
+        }
+
+        Map<ProtectedRegion, String> parentSets = new LinkedHashMap<>();
+
+        for (Map.Entry<String, YAMLNode> namespaceEntry : regionData.entrySet()) {
+            String namespaceKey = namespaceEntry.getKey();
+
+            String namespace = namespaceKey;
+            if (namespace.equals(YAML_GLOBAL_NAMESPACE_NAME)) {
+                namespace = null;
+            }
+
+            for (Map.Entry<String, Object> entry : namespaceEntry.getValue().getMap().entrySet()) {
+                String name = entry.getKey();
+                YAMLNode node = config.getNode("regions." + namespaceKey + "." + name);
+
+                String type = node.getString("type");
+                ProtectedRegion region;
+
+                RegionIdentifier id = new RegionIdentifier(namespace, name);
+                try {
+                    if (type == null) {
+                        log.warning("Undefined region type for region '" + id + "'!\n" +
+                                "Here is what the region data looks like:\n\n" + toYamlOutput(node.getMap()) + "\n");
+                        continue;
+                    } else if (type.equals("cuboid")) {
+                        Vector3 pt1 = checkNotNull(node.getVector("min"));
+                        Vector3 pt2 = checkNotNull(node.getVector("max"));
+                        BlockVector3 min = pt1.getMinimum(pt2).toBlockPoint();
+                        BlockVector3 max = pt1.getMaximum(pt2).toBlockPoint();
+                        region = new ProtectedCuboidRegion(id, min, max);
+                    } else if (type.equals("poly2d")) {
+                        Integer minY = checkNotNull(node.getInt("min-y"));
+                        Integer maxY = checkNotNull(node.getInt("max-y"));
+                        List<BlockVector2> points = node.getBlockVector2List("points", null);
+                        region = new ProtectedPolygonalRegion(id, points, minY, maxY);
+                    } else if (type.equals("global")) {
+                        region = new GlobalProtectedRegion(id);
+                    } else {
+                        log.warning("Unknown region type for region '" + id + "'!\n" +
+                                "Here is what the region data looks like:\n\n" + toYamlOutput(node.getMap()) + "\n");
+                        continue;
+                    }
+
+                    Integer priority = checkNotNull(node.getInt("priority"));
+                    region.setPriority(priority);
+                    FlagParser.One.setFlags(flagRegistry, region, node.getNode("flags"));
+                    region.setOwners(DomainParser.One.parseDomain(node.getNode("owners")));
+                    region.setMembers(DomainParser.One.parseDomain(node.getNode("members")));
+
+                    loaded.put(id.getLegacyQualifiedName(), region);
+
+                    String parentQualifiedName = node.getString("parent");
+                    if (parentQualifiedName != null) {
+                        parentSets.put(region, parentQualifiedName);
+                    }
+                } catch (NullPointerException e) {
+                    log.log(Level.WARNING,
+                            "Unexpected NullPointerException encountered during parsing for the region '" + id + "'!\n" +
+                                    "Here is what the region data looks like:\n\n" + toYamlOutput(node.getMap()) +
+                                    "\n\nNote: This region will disappear as a result!", e);
+                }
+            }
+        }
+
+        // Relink parents
+        RegionDatabaseUtils.relinkParents(loaded, parentSets);
+
+        return new HashSet<>(loaded.values());
+    }
+}

worldguard-core/src/main/java/com/sk89q/worldguard/protection/managers/storage/file/YamlRegionFile.java

@@ -19,56 +19,32 @@
 
 package com.sk89q.worldguard.protection.managers.storage.file;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.sk89q.util.yaml.YAMLFormat;
 import com.sk89q.util.yaml.YAMLNode;
 import com.sk89q.util.yaml.YAMLProcessor;
 import com.sk89q.worldedit.math.BlockVector2;
-import com.sk89q.worldedit.math.BlockVector3;
-import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldguard.domains.DefaultDomain;
 import com.sk89q.worldguard.protection.flags.FlagUtil;
 import com.sk89q.worldguard.protection.flags.registry.FlagRegistry;
 import com.sk89q.worldguard.protection.managers.RegionDifference;
 import com.sk89q.worldguard.protection.managers.storage.DifferenceSaveException;
 import com.sk89q.worldguard.protection.managers.storage.RegionDatabase;
-import com.sk89q.worldguard.protection.managers.storage.RegionDatabaseUtils;
 import com.sk89q.worldguard.protection.managers.storage.StorageException;
-import com.sk89q.worldguard.protection.regions.GlobalProtectedRegion;
+import com.sk89q.worldguard.protection.regions.*;
-import com.sk89q.worldguard.protection.regions.ProtectedCuboidRegion;
-import com.sk89q.worldguard.protection.regions.ProtectedPolygonalRegion;
-import com.sk89q.worldguard.protection.regions.ProtectedRegion;
-import org.yaml.snakeyaml.DumperOptions;
-import org.yaml.snakeyaml.DumperOptions.FlowStyle;
-import org.yaml.snakeyaml.Yaml;
-import org.yaml.snakeyaml.constructor.SafeConstructor;
 import org.yaml.snakeyaml.parser.ParserException;
-import org.yaml.snakeyaml.representer.Representer;
 
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Collections;
+
-import java.util.HashMap;
+import static com.google.common.base.Preconditions.checkNotNull;
-import java.util.HashSet;
+import static com.sk89q.worldguard.protection.managers.storage.file.YamlCommon.YAML_GLOBAL_NAMESPACE_NAME;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import java.util.UUID;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 /**
  * A store that persists regions in a YAML-encoded file.
  */
 public class YamlRegionFile implements RegionDatabase {
-
-    private static final Logger log = Logger.getLogger(YamlRegionFile.class.getCanonicalName());
-    private static final Yaml ERROR_DUMP_YAML;
-
     private static final String FILE_HEADER = "#\r\n" +
             "# WorldGuard regions file\r\n" +
             "#\r\n" +
@@ -81,17 +57,19 @@ public class YamlRegionFile implements RegionDatabase {
             "# REMEMBER TO KEEP PERIODICAL BACKUPS.\r\n" +
             "#";
 
-    private final String name;
+    private static final List<YamlReader> YAML_READERS = new ArrayList<>();
-    private final File file;
 
     static {
-        DumperOptions options = new DumperOptions();
+        // IMPORTANT: For best performance, add these in reverse order.
-        options.setIndent(4);
+        // We always want the latest version to be attempted first, so that once migrated, we are checking
-        options.setDefaultFlowStyle(FlowStyle.AUTO);
+        // one version, not n.
-
+        YAML_READERS.add(new YamlReaderVersionTwo());
-        ERROR_DUMP_YAML = new Yaml(new SafeConstructor(), new Representer(), options);
+        YAML_READERS.add(new YamlReaderVersionOne());
     }
 
+    private final String name;
+    private final File file;
+
     /**
      * Create a new instance.
      *
@@ -112,80 +90,22 @@ public class YamlRegionFile implements RegionDatabase {
 
     @Override
     public Set<ProtectedRegion> loadAll(FlagRegistry flagRegistry) throws StorageException {
-        Map<String, ProtectedRegion> loaded = new HashMap<>();
-
         YAMLProcessor config = createYamlProcessor(file);
         try {
             config.load();
         } catch (FileNotFoundException e) {
-            return new HashSet<>(loaded.values());
+            return new HashSet<>();
         } catch (IOException | ParserException e) {
             throw new StorageException("Failed to load region data from '" + file + "'", e);
         }
 
-        Map<String, YAMLNode> regionData = config.getNodes("regions");
+        for (YamlReader reader : YAML_READERS) {
-
+            if (reader.canLoad(config)) {
-        if (regionData == null) {
+                return reader.load(flagRegistry, config);
-            return Collections.emptySet(); // No regions are even configured
-        }
-
-        Map<ProtectedRegion, String> parentSets = new LinkedHashMap<>();
-
-        for (Map.Entry<String, YAMLNode> entry : regionData.entrySet()) {
-            String id = entry.getKey();
-            YAMLNode node = entry.getValue();
-
-            String type = node.getString("type");
-            ProtectedRegion region;
-
-            try {
-                if (type == null) {
-                    log.warning("Undefined region type for region '" + id + "'!\n" +
-                            "Here is what the region data looks like:\n\n" + toYamlOutput(entry.getValue().getMap()) + "\n");
-                    continue;
-                } else if (type.equals("cuboid")) {
-                    Vector3 pt1 = checkNotNull(node.getVector("min"));
-                    Vector3 pt2 = checkNotNull(node.getVector("max"));
-                    BlockVector3 min = pt1.getMinimum(pt2).toBlockPoint();
-                    BlockVector3 max = pt1.getMaximum(pt2).toBlockPoint();
-                    region = new ProtectedCuboidRegion(id, min, max);
-                } else if (type.equals("poly2d")) {
-                    Integer minY = checkNotNull(node.getInt("min-y"));
-                    Integer maxY = checkNotNull(node.getInt("max-y"));
-                    List<BlockVector2> points = node.getBlockVector2List("points", null);
-                    region = new ProtectedPolygonalRegion(id, points, minY, maxY);
-                } else if (type.equals("global")) {
-                    region = new GlobalProtectedRegion(id);
-                } else {
-                    log.warning("Unknown region type for region '" + id + "'!\n" +
-                            "Here is what the region data looks like:\n\n" + toYamlOutput(entry.getValue().getMap()) + "\n");
-                    continue;
-                }
-
-                Integer priority = checkNotNull(node.getInt("priority"));
-                region.setPriority(priority);
-                setFlags(flagRegistry, region, node.getNode("flags"));
-                region.setOwners(parseDomain(node.getNode("owners")));
-                region.setMembers(parseDomain(node.getNode("members")));
-
-                loaded.put(id, region);
-
-                String parentId = node.getString("parent");
-                if (parentId != null) {
-                    parentSets.put(region, parentId);
-                }
-            } catch (NullPointerException e) {
-                log.log(Level.WARNING,
-                        "Unexpected NullPointerException encountered during parsing for the region '" + id + "'!\n" +
-                                "Here is what the region data looks like:\n\n" + toYamlOutput(entry.getValue().getMap()) +
-                                "\n\nNote: This region will disappear as a result!", e);
             }
         }
 
-        // Relink parents
+        throw new IllegalStateException("No YAML reader was registered that understands the saved region information");
-        RegionDatabaseUtils.relinkParents(loaded, parentSets);
-
-        return new HashSet<>(loaded.values());
     }
 
     @Override
@@ -197,13 +117,25 @@ public class YamlRegionFile implements RegionDatabase {
 
         config.clear();
 
+        config.setProperty("version", YAML_READERS.get(0).getVersion());
         YAMLNode regionsNode = config.addNode("regions");
-        Map<String, Object> map = regionsNode.getMap();
+
+        // Creates a mapping of existing namespace node names, to their underlying YAMLNode.
+        Map<String, YAMLNode> namespaceMap = new HashMap<>();
 
         for (ProtectedRegion region : regions) {
-            Map<String, Object> nodeMap = new HashMap<>();
+            RegionIdentifier identifier = region.getIdentifier();
-            map.put(region.getId(), nodeMap);
+
-            YAMLNode node = new YAMLNode(nodeMap, false);
+            String internalNamespace = identifier.getNamespace().orElse(YAML_GLOBAL_NAMESPACE_NAME);
+            YAMLNode namespaceNode = namespaceMap.compute(internalNamespace, (ignored, existingNamespaceNode) -> {
+                if (existingNamespaceNode == null) {
+                    existingNamespaceNode = regionsNode.addNode(internalNamespace);
+                }
+
+                return existingNamespaceNode;
+            });
+
+            YAMLNode node = namespaceNode.addNode(identifier.getName());
 
             if (region instanceof ProtectedCuboidRegion) {
                 ProtectedCuboidRegion cuboid = (ProtectedCuboidRegion) region;
@@ -238,7 +170,7 @@ public class YamlRegionFile implements RegionDatabase {
 
             ProtectedRegion parent = region.getParent();
             if (parent != null) {
-                node.setProperty("parent", parent.getId());
+                node.setProperty("parent", parent.getIdentifier().getLegacyQualifiedName());
             }
         }
 
@@ -257,46 +189,10 @@ public class YamlRegionFile implements RegionDatabase {
         throw new DifferenceSaveException("Not supported");
     }
 
-    private DefaultDomain parseDomain(YAMLNode node) {
-        if (node == null) {
-            return new DefaultDomain();
-        }
-
-        DefaultDomain domain = new DefaultDomain();
-
-        for (String name : node.getStringList("players", null)) {
-            if (!name.isEmpty()) {
-                domain.addPlayer(name);
-            }
-        }
-
-        for (String stringId : node.getStringList("unique-ids", null)) {
-            try {
-                domain.addPlayer(UUID.fromString(stringId));
-            } catch (IllegalArgumentException e) {
-                log.log(Level.WARNING, "Failed to parse UUID '" + stringId + "'", e);
-            }
-        }
-
-        for (String name : node.getStringList("groups", null)) {
-            if (!name.isEmpty()) {
-                domain.addGroup(name);
-            }
-        }
-
-        return domain;
-    }
-
     private Map<String, Object> getFlagData(ProtectedRegion region) {
         return FlagUtil.marshal(region.getFlags());
     }
 
-    private void setFlags(FlagRegistry flagRegistry, ProtectedRegion region, YAMLNode flagsData) {
-        if (flagsData != null) {
-            region.setFlags(flagRegistry.unmarshal(flagsData.getMap(), true));
-        }
-    }
-
     private Map<String, Object> getDomainData(DefaultDomain domain) {
         Map<String, Object> domainData = new HashMap<>();
 
@@ -331,19 +227,4 @@ public class YamlRegionFile implements RegionDatabase {
         checkNotNull(file);
         return new YAMLProcessor(file, false, YAMLFormat.COMPACT);
     }
-
-    /**
-     * Dump the given object as YAML for debugging purposes.
-     *
-     * @param object the object
-     * @return the YAML string or an error string if dumping fals
-     */
-    private static String toYamlOutput(Object object) {
-        try {
-            return ERROR_DUMP_YAML.dump(object).replaceAll("(?m)^", "\t");
-        } catch (Throwable t) {
-            return "<error while dumping object>";
-        }
-    }
-
 }

worldguard-core/src/main/java/com/sk89q/worldguard/protection/regions/GlobalProtectedRegion.java

@@ -44,6 +44,7 @@ public class GlobalProtectedRegion extends ProtectedRegion {
      *
      * @param id the ID
      */
+    @Deprecated
     public GlobalProtectedRegion(String id) {
         this(id, false);
     }
@@ -54,7 +55,29 @@ public class GlobalProtectedRegion extends ProtectedRegion {
      * @param id the ID
      * @param transientRegion whether this region should only be kept in memory and not be saved
      */
+    @Deprecated
     public GlobalProtectedRegion(String id, boolean transientRegion) {
+        this(new RegionIdentifier(id), transientRegion);
+    }
+
+    /**
+     * Create a new instance.<br>
+     * Equivalent to {@link #GlobalProtectedRegion(String, boolean) GlobalProtectedRegion(id, false)}<br>
+     * <code>transientRegion</code> will be set to false, and this region can be saved.
+     *
+     * @param id the region identifier
+     */
+    public GlobalProtectedRegion(RegionIdentifier id) {
+        this(id, false);
+    }
+
+    /**
+     * Create a new instance.
+     *
+     * @param id the region identifier
+     * @param transientRegion whether this region should only be kept in memory and not be saved
+     */
+    public GlobalProtectedRegion(RegionIdentifier id, boolean transientRegion) {
         super(id, transientRegion);
         min = BlockVector3.ZERO;
         max = BlockVector3.ZERO;

worldguard-core/src/main/java/com/sk89q/worldguard/protection/regions/ProtectedCuboidRegion.java

@@ -47,6 +47,7 @@ public class ProtectedCuboidRegion extends ProtectedRegion {
      * @param pt1 the first point of this region
      * @param pt2 the second point of this region
      */
+    @Deprecated
     public ProtectedCuboidRegion(String id, BlockVector3 pt1, BlockVector3 pt2) {
         this(id, false, pt1, pt2);
     }
@@ -59,7 +60,34 @@ public class ProtectedCuboidRegion extends ProtectedRegion {
      * @param pt1 the first point of this region
      * @param pt2 the second point of this region
      */
+    @Deprecated
     public ProtectedCuboidRegion(String id, boolean transientRegion, BlockVector3 pt1, BlockVector3 pt2) {
+        this(new RegionIdentifier(id), transientRegion, pt1, pt2);
+    }
+
+    /**
+     * Construct a new instance of this cuboid region.<br>
+     * Equivalent to {@link #ProtectedCuboidRegion(RegionIdentifier, boolean, BlockVector3, BlockVector3)
+     * ProtectedCuboidRegion(id, false, pt1, pt2)}<br>
+     * <code>transientRegion</code> will be set to false, and this region can be saved.
+     *
+     * @param id the region identifier
+     * @param pt1 the first point of this region
+     * @param pt2 the second point of this region
+     */
+    public ProtectedCuboidRegion(RegionIdentifier id, BlockVector3 pt1, BlockVector3 pt2) {
+        this(id, false, pt1, pt2);
+    }
+
+    /**
+     * Construct a new instance of this cuboid region.
+     *
+     * @param id the region identifier
+     * @param transientRegion whether this region should only be kept in memory and not be saved
+     * @param pt1 the first point of this region
+     * @param pt2 the second point of this region
+     */
+    public ProtectedCuboidRegion(RegionIdentifier id, boolean transientRegion, BlockVector3 pt1, BlockVector3 pt2) {
         super(id, transientRegion);
         setMinMaxPoints(pt1, pt2);
     }

worldguard-core/src/main/java/com/sk89q/worldguard/protection/regions/ProtectedPolygonalRegion.java

@@ -47,6 +47,7 @@ public class ProtectedPolygonalRegion extends ProtectedRegion {
      * @param minY the minimum y coordinate
      * @param maxY the maximum y coordinate
      */
+    @Deprecated
     public ProtectedPolygonalRegion(String id, List<BlockVector2> points, int minY, int maxY) {
         this(id, false, points, minY, maxY);
     }
@@ -60,7 +61,37 @@ public class ProtectedPolygonalRegion extends ProtectedRegion {
      * @param minY the minimum y coordinate
      * @param maxY the maximum y coordinate
      */
+    @Deprecated
     public ProtectedPolygonalRegion(String id, boolean transientRegion, List<BlockVector2> points, int minY, int maxY) {
+        this(new RegionIdentifier(id), transientRegion, points, minY, maxY);
+    }
+
+    /**
+     * Construct a new instance of this polygonal region.<br>
+     * Equivalent to {@link #ProtectedPolygonalRegion(RegionIdentifier, boolean, List, int, int)
+     * ProtectedPolygonalRegion(id, false, points, minY, maxY)}<br>
+     * <code>transientRegion</code> will be set to false, and this region can be saved.
+     *
+     * @param id the region identifier
+     * @param points a {@link List} of points that this region should contain
+     * @param minY the minimum y coordinate
+     * @param maxY the maximum y coordinate
+     */
+    public ProtectedPolygonalRegion(RegionIdentifier id, List<BlockVector2> points, int minY, int maxY) {
+        this(id, false, points, minY, maxY);
+    }
+
+    /**
+     * Construct a new instance of this polygonal region.
+     *
+     * @param id the region identifier
+     * @param transientRegion whether this region should only be kept in memory and not be saved
+     * @param points a {@link List} of points that this region should contain
+     * @param minY the minimum y coordinate
+     * @param maxY the maximum y coordinate
+     */
+    public ProtectedPolygonalRegion(RegionIdentifier id, boolean transientRegion, List<BlockVector2> points,
+                                    int minY, int maxY) {
         super(id, transientRegion);
         ImmutableList<BlockVector2> immutablePoints = ImmutableList.copyOf(points);
         setMinMaxPoints(immutablePoints, minY, maxY);

worldguard-core/src/main/java/com/sk89q/worldguard/protection/regions/ProtectedRegion.java

@@ -28,7 +28,6 @@ import com.sk89q.worldguard.LocalPlayer;
 import com.sk89q.worldguard.domains.DefaultDomain;
 import com.sk89q.worldguard.protection.flags.Flag;
 import com.sk89q.worldguard.util.ChangeTracked;
-import com.sk89q.worldguard.util.Normal;
 
 import java.awt.geom.Area;
 import java.awt.geom.Line2D;
@@ -37,7 +36,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
-import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
 
@@ -50,12 +48,11 @@ import javax.annotation.Nullable;
 public abstract class ProtectedRegion implements ChangeTracked, Comparable<ProtectedRegion> {
 
     public static final String GLOBAL_REGION = "__global__";
-    private static final Pattern VALID_ID_PATTERN = Pattern.compile("^[A-Za-z0-9_,'\\-\\+/]{1,}$");
 
     protected BlockVector3 min;
     protected BlockVector3 max;
 
-    private final String id;
+    private final RegionIdentifier id;
     private final boolean transientRegion;
     private int priority = 0;
     private ProtectedRegion parent;
@@ -67,18 +64,13 @@ public abstract class ProtectedRegion implements ChangeTracked, Comparable<Prote
     /**
      * Construct a new instance of this region.
      *
-     * @param id the name of this region
+     * @param id the name information for this region
      * @param transientRegion whether this region should only be kept in memory and not be saved
-     * @throws IllegalArgumentException thrown if the ID is invalid (see {@link #isValidId(String)}
      */
-    ProtectedRegion(String id, boolean transientRegion) { // Package private because we can't have people creating their own region types
+    ProtectedRegion(RegionIdentifier id, boolean transientRegion) { // Package private because we can't have people creating their own region types
         checkNotNull(id);
 
-        if (!isValidId(id)) {
+        this.id = id;
-            throw new IllegalArgumentException("Invalid region ID: " + id);
-        }
-
-        this.id = Normal.normalize(id);
         this.transientRegion = transientRegion;
     }
 
@@ -119,7 +111,17 @@ public abstract class ProtectedRegion implements ChangeTracked, Comparable<Prote
      *
      * @return the name
      */
+    @Deprecated
     public String getId() {
+        return id.getLegacyQualifiedName();
+    }
+
+    /**
+     * Gets the identifier info for this region.
+     *
+     * @return the identifier info
+     */
+    public RegionIdentifier getIdentifier() {
         return id;
     }
 
@@ -734,9 +736,9 @@ public abstract class ProtectedRegion implements ChangeTracked, Comparable<Prote
      * @param id the id to check
      * @return whether the region id given is valid
      */
+    @Deprecated
     public static boolean isValidId(String id) {
-        checkNotNull(id);
+        return RegionIdentifier.isValidName(id);
-        return VALID_ID_PATTERN.matcher(id).matches();
     }
 
     /**

worldguard-core/src/main/java/com/sk89q/worldguard/protection/regions/RegionIdentifier.java

@@ -0,0 +1,147 @@
+/*
+ * WorldGuard, a suite of tools for Minecraft
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldGuard team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldguard.protection.regions;
+
+import com.sk89q.worldedit.extension.platform.Actor;
+import com.sk89q.worldguard.LocalPlayer;
+import com.sk89q.worldguard.WorldGuard;
+import com.sk89q.worldguard.util.Normal;
+import com.sk89q.worldguard.util.profile.Profile;
+
+import javax.annotation.Nullable;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.regex.Pattern;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public final class RegionIdentifier {
+    private static final Pattern VALID_NAME_PATTERN = Pattern.compile("^[A-Za-z0-9_,'\\-\\+/]{1,}$");
+
+    private String namespace;
+    private String name;
+
+    /**
+     * Construct a new RegionIdentifier for describing region name information, using the global namespace.<br>
+     * Equivalent to {@link #RegionIdentifier(String, String) RegionIdentifier(null, name)}<br>
+     * <code>namespace</code> will be set to null.
+     *
+     * @param name the name for this region
+     * @throws IllegalArgumentException thrown if the name is invalid (see {@link #isValidName(String)}
+     */
+    public RegionIdentifier(String name) {
+        this(null, name);
+    }
+
+    /**
+     * Construct a new RegionIdentifier for describing region name information.
+     *
+     * @param namespace the namespace name for this region, or null if there isn't one
+     * @param name the name for this region
+     * @throws IllegalArgumentException thrown if the namespace is invalid (see {@link #isValidNamespace(String)}
+     * @throws IllegalArgumentException thrown if the name is invalid (see {@link #isValidName(String)}
+     */
+    public RegionIdentifier(@Nullable String namespace, String name) {
+        if (!isValidNamespace(name)) {
+            throw new IllegalArgumentException("Invalid region namespace: " + namespace);
+        }
+
+        if (!isValidName(name)) {
+            throw new IllegalArgumentException("Invalid region name: " + name);
+        }
+
+        this.namespace = namespace == null ? null : Normal.normalize(namespace);
+        this.name = Normal.normalize(name);
+    }
+
+    /**
+     * Returns the qualified name. This is incompatible with the legacy naming scheme, and
+     * should be used when interacting with the command system. This will ensure that the correct
+     * region is referenced regardless of the user's default namespace.
+     *
+     * @return the qualified name
+     */
+    public String getQualifiedName() {
+        return getNamespace().orElse("") + ":" + name;
+    }
+
+    /**
+     * Returns the legacy qualified name. This is compatible with the legacy naming scheme, and
+     * should be used when interacting with the region manager via names.
+     *
+     * If you're using this outside of WorldGuard internals, you're doing something wrong.
+     *
+     * @return the legacy qualified name
+     */
+    @Deprecated
+    public String getLegacyQualifiedName() {
+        return getNamespace().map((ns) -> ns + ':' + getName()).orElse(getName());
+    }
+
+    /**
+     * Compresses the name into a more user friendly macro based name.
+     *
+     * @param actor a player context
+     * @return the user friendly display name
+     */
+    public String getDisplayName(Actor actor) {
+        if (actor instanceof LocalPlayer) {
+            LocalPlayer player = (LocalPlayer) actor;
+            if (player.isDefaultNamespace(namespace)) {
+                return name;
+            }
+        }
+
+        if (namespace != null) {
+            try {
+                UUID playerID = UUID.fromString(namespace);
+                Profile profile = WorldGuard.getInstance().getProfileCache().getIfPresent(playerID);
+                if (profile != null) {
+                    return "#" + profile.getName() + ":" + name;
+                }
+            } catch (IllegalArgumentException ignored) {
+            }
+        }
+
+        // Fall back to the fully qualified name.
+        return getQualifiedName();
+    }
+
+    public Optional<String> getNamespace() {
+        return Optional.ofNullable(namespace);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public static boolean isValidNamespace(String namespace) {
+        if (namespace == null) {
+            return true;
+        }
+
+        return VALID_NAME_PATTERN.matcher(namespace).matches();
+    }
+
+    public static boolean isValidName(String name) {
+        checkNotNull(name);
+        return VALID_NAME_PATTERN.matcher(name).matches();
+    }
+}

worldguard-core/src/test/java/com/sk89q/worldguard/TestPlayer.java

@@ -64,6 +64,11 @@ public class TestPlayer extends AbstractPlayerActor implements LocalPlayer {
         return uuid;
     }
 
+    @Override
+    public String getDefaultNamespace() {
+        return null;
+    }
+
     @Override
     public boolean hasGroup(String group) {
         return groups.contains(group.toLowerCase());