rdf_rdfa_attributes($mapping, $data = NULL)
Builds an array of RDFa attributes for a given mapping.
This array will typically be passed through Drupal\Core\Template\Attribute 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.
Parameters
array $mapping: An array containing a mandatory 'properties' key and optional 'datatype', 'datatype_callback' and 'type' keys. For example:
array(
'properties' => array('schema:interactionCount'),
'datatype' => 'xsd:integer',
'datatype_callback' => array(
'callable' => 'Drupal\rdf\SchemaOrgDataConverter::interactionCount',
'arguments' => array(
'interaction_type' => 'UserComments'
),
),
);
mixed $data: (optional) A value that needs to be converted by the provided callback function.
Return value
array RDFa attributes suitable for Drupal\Core\Template\Attribute.
Related topics
- RDF Mapping API
- Functions to describe entities and bundles in RDF.
File
- core/modules/rdf/rdf.module, line 167
- Enables semantically enriched output for Drupal sites in the form of RDFa.
Code
function rdf_rdfa_attributes($mapping, $data = NULL) {
$attributes = array();
// The type of mapping defaults to 'property'.
$type = isset($mapping['mapping_type']) ? $mapping['mapping_type'] : 'property';
switch ($type) {
// The mapping expresses the relationship between two resources.
case 'rel':
case 'rev':
$attributes[$type] = $mapping['properties'];
break;
// The mapping expresses the relationship between a resource and some
// literal text.
case 'property':
if (!empty($mapping['properties'])) {
$attributes['property'] = $mapping['properties'];
// Convert $data to a specific format as per the callback function.
if (isset($data) && !empty($mapping['datatype_callback'])) {
$callback = $mapping['datatype_callback']['callable'];
$arguments = isset($mapping['datatype_callback']['arguments']) ? $mapping['datatype_callback']['arguments'] : NULL;
$attributes['content'] = call_user_func($callback, $data, $arguments);
}
if (isset($mapping['datatype'])) {
$attributes['datatype'] = $mapping['datatype'];
}
break;
}
}
return $attributes;
}
Please login to continue.