function rdf_rdfa_attributes

Builds an array of RDFa attributes for a given mapping. This array will typically be passed through drupal_attributes() to create the attributes variables that are available to template files. These include $attributes, $title_attributes, $content_attributes and the field-specific $item_attributes variables. For more information, see theme_rdf_template_variable_wrapper().

Parameters

$mapping: An array containing a mandatory 'predicates' key and optional 'datatype', 'callback' and 'type' keys. For example:

    array(
      'predicates' => array('dc:created'),
      'datatype' => 'xsd:dateTime',
      'callback' => 'date_iso8601',
      ),
    );
  

$data: A value that needs to be converted by the provided callback function.

Return value

An array containing RDFa attributes suitable for drupal_attributes().

Related topics

File

modules/rdf/rdf.module, line 307

Code

function rdf_rdfa_attributes($mapping, $data = NULL) {
    // The type of mapping defaults to 'property'.
    $type = isset($mapping['type']) ? $mapping['type'] : 'property';
    switch ($type) {
        // The mapping expresses the relationship between two resources.
        case 'rel':
        case 'rev':
            $attributes[$type] = $mapping['predicates'];
            break;
        // The mapping expresses the relationship between a resource and some
        // literal text.
        case 'property':
            $attributes['property'] = $mapping['predicates'];
            // Convert $data to a specific format as per the callback function.
            if (isset($data) && isset($mapping['callback']) && function_exists($mapping['callback'])) {
                $callback = $mapping['callback'];
                $attributes['content'] = $callback($data);
            }
            if (isset($mapping['datatype'])) {
                $attributes['datatype'] = $mapping['datatype'];
            }
            break;
    }
    return $attributes;
}