template_preprocess_rdf_metadata(&$variables)
Prepares variables for RDF metadata templates.
Default template: rdf-metadata.html.twig.
Sometimes it is useful to export data which is not semantically present in the HTML output. For example, a hierarchy of comments is visible for a human but not for machines because this hierarchy is not present in the DOM tree. We can express it in RDFa via empty <span> tags. These aren't visible and give machines extra information about the content and its structure.
Parameters
array $variables: An associative array containing:
- metadata: An array of attribute arrays. Each item in the array corresponds to its own set of attributes, and therefore, needs its own element.
File
- core/modules/rdf/rdf.module, line 596
- Enables semantically enriched output for Drupal sites in the form of RDFa.
Code
function template_preprocess_rdf_metadata(&$variables) { foreach ($variables['metadata'] as $key => $attributes) { if (!is_null($attributes)) { $variables['metadata'][$key] = new Attribute($attributes); } else { $variables['metadata'][$key] = new Attribute(); } } }
Please login to continue.