Adding an XSL stylesheet

You can add an XSL stylesheet processing instruction to make your sitemaps human readable in browsers. Call setStylesheet on either a Sitemap or SitemapIndex:

use Spatie\Sitemap\Sitemap;
use Spatie\Sitemap\SitemapIndex;

Sitemap::create()
    ->setStylesheet('/sitemap.xsl')
    ->add('/page1')
    ->writeToFile($sitemapPath);

SitemapIndex::create()
    ->setStylesheet('/sitemap-index.xsl')
    ->add('/pages_sitemap.xml')
    ->writeToFile($sitemapIndexPath);

When using maxTagsPerSitemap on a Sitemap with a stylesheet set, the stylesheet will be propagated to both the generated index and all chunk sitemaps.