The previous filter failed the goal of allowing developers to filter all providers before they are registered, since it only filtered the built-in ones.
The more specific `wp_sitemaps_add_provider` filter enables exactly that, as it filters every sitemap provider right before it is added to the sitemaps registry.
Props pbiron, pfefferle, Chouby, swissspidy.
Fixes#50660.
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If sitemaps are disabled, previously there would be a rewrite rule for the sitemap endpoint. This endpoint would display the homepage since there was a rewrite rule. Now, Sitemaps are loaded, and the proper HTTP headers are returned.
Fixes#50643.
Props swissspidy, kraftbj, donmhico.
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If there are no pages and no static homepage, there will still be one sitemap including the homepage URL.
This change ensures that this sitemap is correctly listed in the sitemap index.
Props Chouby, pacifika, elrae.
Fixes#50571.
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While web crawlers are able to discover pages from links within the site and from other sites, XML sitemaps supplement this approach by allowing crawlers to quickly and comprehensively identify all URLs included in the sitemap and learn other signals about those URLs using the associated metadata.
See https://make.wordpress.org/core/2020/06/10/merge-announcement-extensible-core-sitemaps/ for more details.
This feature exposes the sitemap index via `/wp-sitemap.xml` and exposes a variety of new filters and hooks for developers to modify the behavior. Users can disable sitemaps completely by turning off search engine visibility in WordPress admin.
This change also introduces a new `esc_xml()` function to escape strings for output in XML, as well as XML support to `wp_kses_normalize_entities()`.
Props Adrian McShane, afragen, adamsilverstein, casiepa, flixos90, garrett-eclipse, joemcgill, kburgoine, kraftbj, milana_cap, pacifika, pbiron, pfefferle, Ruxandra Gradina, swissspidy, szepeviktor, tangrufus, tweetythierry.
Fixes#50117.
See #3670. See #19998.
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