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function rdf_preprocess_html in Drupal 9

Same name and namespace in other branches
  1. 8 core/modules/rdf/rdf.module \rdf_preprocess_html()
  2. 10 core/modules/rdf/rdf.module \rdf_preprocess_html()

Implements hook_preprocess_HOOK() for HTML document templates.

File

core/modules/rdf/rdf.module, line 268
Enables semantically enriched output for Drupal sites in the form of RDFa.

Code

function rdf_preprocess_html(&$variables) {

  // Adds RDF namespace prefix bindings in the form of an RDFa 1.1 prefix
  // attribute inside the html element.
  if (!isset($variables['html_attributes']['prefix'])) {
    $variables['html_attributes']['prefix'] = [];
  }
  foreach (rdf_get_namespaces() as $prefix => $uri) {
    $variables['html_attributes']['prefix'][] = $prefix . ': ' . $uri . " ";
  }
}