wp-includes/sitemaps/class-wp-sitemaps.php:130Registers sitemap rewrite tags and routing rules.
public function register_rewrites() { // Add rewrite tags. add_rewrite_tag( '%sitemap%', '([^?]+)' ); add_rewrite_tag( '%sitemap-subtype%', '([^?]+)' ); // Register index route. add_rewrite_rule( '^wp-sitemap\.xml$', 'index.php?sitemap=index', 'top' ); // Register rewrites for the XSL stylesheet. add_rewrite_tag( '%sitemap-stylesheet%', '([^?]+)' ); add_rewrite_rule( '^wp-sitemap\.xsl$', 'index.php?sitemap-stylesheet=sitemap', 'top' ); add_rewrite_rule( '^wp-sitemap-index\.xsl$', 'index.php?sitemap-stylesheet=index', 'top' ); // Register routes for providers. add_rewrite_rule( '^wp-sitemap-([a-z]+?)-([a-z\d_-]+?)-(\d+?)\.xml$', 'index.php?sitemap=$matches[1]&sitemap-subtype=$matches[2]&paged=$matches[3]', 'top' ); add_rewrite_rule( '^wp-sitemap-([a-z]+?)-(\d+?)\.xml$', 'index.php?sitemap=$matches[1]&paged=$matches[2]', 'top' ); }Introduced in 5.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/sitemaps/class-wp-sitemaps.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.