Source
File: wp-includes/sitemaps/class-wp-sitemaps-stylesheet.php
public function get_sitemap_index_stylesheet() {
$css = $this->get_stylesheet_css();
$title = esc_xml( __( 'XML Sitemap' ) );
$description = esc_xml( __( 'This XML Sitemap is generated by WordPress to make your content more visible for search engines.' ) );
$learn_more = sprintf(
'<a href="%s">%s</a>',
esc_url( __( 'https://www.sitemaps.org/' ) ),
esc_xml( __( 'Learn more about XML sitemaps.' ) )
);
$text = sprintf(
/* translators: %s: Number of URLs. */
esc_xml( __( 'Number of URLs in this XML Sitemap: %s.' ) ),
'<xsl:value-of select="count( sitemap:sitemapindex/sitemap:sitemap )" />'
);
$lang = get_language_attributes( 'html' );
$url = esc_xml( __( 'URL' ) );
$lastmod = esc_xml( __( 'Last Modified' ) );
$xsl_content = <<<XSL
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:sitemap="http://www.sitemaps.org/schemas/sitemap/0.9"
exclude-result-prefixes="sitemap"
>
<xsl:output method="html" encoding="UTF-8" indent="yes" />
<!--
Set variables for whether lastmod occurs for any sitemap in the index.
We do this up front because it can be expensive in a large sitemap.
-->
<xsl:variable name="has-lastmod" select="count( /sitemap:sitemapindex/sitemap:sitemap/sitemap:lastmod )" />
<xsl:template match="/">
<html {$lang}>
<head>
<title>{$title}</title>
<style>
{$css}
</style>
</head>
<body>
<div id="sitemap">
<div id="sitemap__header">
<h1>{$title}</h1>
<p>{$description}</p>
<p>{$learn_more}</p>
</div>
<div id="sitemap__content">
<p class="text">{$text}</p>
<table id="sitemap__table">
<thead>
<tr>
<th class="loc">{$url}</th>
<xsl:if test="\$has-lastmod">
<th class="lastmod">{$lastmod}</th>
</xsl:if>
</tr>
</thead>
<tbody>
<xsl:for-each select="sitemap:sitemapindex/sitemap:sitemap">
<tr>
<td class="loc"><a href="{sitemap:loc}"><xsl:value-of select="sitemap:loc" /></a></td>
<xsl:if test="\$has-lastmod">
<td class="lastmod"><xsl:value-of select="sitemap:lastmod" /></td>
</xsl:if>
</tr>
</xsl:for-each>
</tbody>
</table>
</div>
</div>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
XSL;
/**
* Filters the content of the sitemap index stylesheet.
*
* @since 5.5.0
*
* @param string $xsl_content Full content for the XML stylesheet.
*/
return apply_filters( 'wp_sitemaps_stylesheet_index_content', $xsl_content );
}