/* v1.3.39 – öffentliche REST-Schnittstelle für ausgewählte Sound-of-Delight-Termine */
function daniel_live_soundofdelight_projects() {
  return [
    'The Acoustic Project',
    'Unplugged Avenue',
    'Die Zwei',
  ];
}

function daniel_live_register_soundofdelight_rest_route() {
  register_rest_route('daniel-live/v1', '/soundofdelight-termine', [
    'methods'             => WP_REST_Server::READABLE,
    'callback'            => 'daniel_live_soundofdelight_rest_terms',
    'permission_callback' => '__return_true',
  ]);
}
add_action('rest_api_init', 'daniel_live_register_soundofdelight_rest_route');

function daniel_live_soundofdelight_rest_terms(WP_REST_Request $request) {
  $today = current_time('Y-m-d');
  $allowed = daniel_live_soundofdelight_projects();

  $query = new WP_Query([
    'post_type'      => 'termin',
    'post_status'    => 'publish',
    'posts_per_page' => 100,
    'meta_key'       => 'datum',
    'orderby'        => 'meta_value',
    'order'          => 'ASC',
    'meta_query'     => [
      'relation' => 'AND',
      [
        'key'     => 'datum',
        'value'   => $today,
        'compare' => '>=',
        'type'    => 'DATE',
      ],
      [
        'key'     => 'projekt',
        'value'   => $allowed,
        'compare' => 'IN',
      ],
    ],
    'no_found_rows'  => true,
  ]);

  $items = [];
  foreach ($query->posts as $post) {
    $post_id = $post->ID;
    $datum   = get_post_meta($post_id, 'datum', true);
    $uhrzeit = get_post_meta($post_id, 'uhrzeit', true);
    $projekt = get_post_meta($post_id, 'projekt', true);
    $ort     = get_post_meta($post_id, 'ort', true);
    $link    = get_post_meta($post_id, 'termin_link', true);

    if (!in_array($projekt, $allowed, true)) continue;
    if (!$datum || !preg_match('/^\\d{4}-\\d{2}-\\d{2}$/', $datum)) continue;

    $items[] = [
      'id'           => (int) $post_id,
      'datum'        => sanitize_text_field($datum),
      'uhrzeit'      => preg_match('/^\\d{2}:\\d{2}$/', $uhrzeit) ? sanitize_text_field($uhrzeit) : '',
      'veranstaltung'=> html_entity_decode(get_the_title($post_id), ENT_QUOTES, 'UTF-8'),
      'projekt'      => sanitize_text_field($projekt),
      'ort'          => sanitize_text_field($ort),
      'link'         => $link ? esc_url_raw($link) : '',
      'kalender_url' => esc_url_raw(daniel_live_calendar_url($post_id)),
    ];
  }

  $response = rest_ensure_response([
    'updated' => current_time('c'),
    'count'   => count($items),
    'termine' => $items,
  ]);
  $response->header('Cache-Control', 'public, max-age=300');
  return $response;
}
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://daniel-drums.de/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://daniel-drums.de/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://daniel-drums.de/wp-sitemap-posts-projekt-1.xml</loc></sitemap><sitemap><loc>https://daniel-drums.de/wp-sitemap-posts-termin-1.xml</loc></sitemap><sitemap><loc>https://daniel-drums.de/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>