function get_avif_picture($attachment_id, $size = 'full', $alt = '') {
    $jpg_url = wp_get_attachment_image_url($attachment_id, $size);
    // This assumes you upload an AVIF with the exact same filename
    $avif_url = str_replace(['.jpg', '.jpeg', '.png'], '.avif', $jpg_url);
    
    // Get alt text if not provided
    if (empty($alt)) {
        $alt = get_post_meta($attachment_id, '_wp_attachment_image_alt', true);
    }

    $html = '<picture>';
    $html .= '<source srcset="' . esc_url($avif_url) . '" type="image/avif">';
    $html .= '<img src="' . esc_url($jpg_url) . '" alt="' . esc_attr($alt) . '" loading="lazy">';
    $html .= '</picture>';

    return $html;
}<?xml version='1.0' encoding='UTF-8'?><?xml-stylesheet type='text/xsl' href='https://www.jonathantheresa.com/wp-content/plugins/google-sitemap-generator/sitemap.xsl'?><!-- sitemap-generator-url='http://www.arnebrachhold.de' sitemap-generator-version='4.1.23' -->
<!-- generated-on='May 2, 2026 1:11 pm' -->
<sitemapindex xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/siteindex.xsd' xmlns='http://www.sitemaps.org/schemas/sitemap/0.9'>	<sitemap>
		<loc>https://www.jonathantheresa.com/sitemap-misc.xml</loc>
		<lastmod>2026-05-02T12:28:17+00:00</lastmod>
	</sitemap>
	<sitemap>
		<loc>https://www.jonathantheresa.com/post_tag-sitemap.xml</loc>
		<lastmod>2026-05-02T12:28:17+00:00</lastmod>
	</sitemap>
	<sitemap>
		<loc>https://www.jonathantheresa.com/post-sitemap.xml</loc>
		<lastmod>2026-05-02T12:28:17+00:00</lastmod>
	</sitemap>
	<sitemap>
		<loc>https://www.jonathantheresa.com/page-sitemap.xml</loc>
		<lastmod>2025-11-16T01:21:32+00:00</lastmod>
	</sitemap>
</sitemapindex><!-- <p>Please edit wp-db.inc.php in wp-includes and set SAVEQUERIES to true if you want to see the queries.</p> --> <!-- Request ID: dd2a22ca9ab977700b92d53ec104abb6; Queries for sitemap: 40; Total queries: 79; Seconds: 0.05; Memory for sitemap: 1KB; Total memory: 79.5MB -->