danielebarchiesi@0: <?php
danielebarchiesi@0: 
danielebarchiesi@0: /**
danielebarchiesi@0:  * @file
danielebarchiesi@0:  * Hooks provided by the RDF module.
danielebarchiesi@0:  */
danielebarchiesi@0: 
danielebarchiesi@0: /**
danielebarchiesi@0:  * @addtogroup hooks
danielebarchiesi@0:  * @{
danielebarchiesi@0:  */
danielebarchiesi@0: 
danielebarchiesi@0: /**
danielebarchiesi@0:  * Allow modules to define RDF mappings for field bundles.
danielebarchiesi@0:  *
danielebarchiesi@0:  * Modules defining their own field bundles can specify which RDF semantics
danielebarchiesi@0:  * should be used to annotate these bundles. These mappings are then used for
danielebarchiesi@0:  * automatic RDFa output in the HTML code.
danielebarchiesi@0:  *
danielebarchiesi@0:  * @return
danielebarchiesi@0:  *   A list of mapping structures, where each mapping is an associative array:
danielebarchiesi@0:  *   - type: The name of an entity type (e.g., 'node', 'comment', and so on.)
danielebarchiesi@0:  *   - bundle: The name of the bundle (e.g., 'page', 'blog', or
danielebarchiesi@0:  *     RDF_DEFAULT_BUNDLE for default mappings.)
danielebarchiesi@0:  *   - mapping: The mapping structure which applies to the entity type and
danielebarchiesi@0:  *     bundle. A mapping structure is an array with keys corresponding to
danielebarchiesi@0:  *     existing field instances in the bundle. Each field is then described in
danielebarchiesi@0:  *     terms of the RDF mapping:
danielebarchiesi@0:  *     - predicates: An array of RDF predicates which describe the relation
danielebarchiesi@0:  *       between the bundle (RDF subject) and the value of the field (RDF
danielebarchiesi@0:  *       object). This value is either some text, another bundle, or a URI in
danielebarchiesi@0:  *       general.
danielebarchiesi@0:  *     - datatype: Is used along with 'callback' to format data so that it is
danielebarchiesi@0:  *       readable by machines. A typical example is a date which can be written
danielebarchiesi@0:  *       in many different formats but should be translated into a uniform
danielebarchiesi@0:  *       format for machine consumption.
danielebarchiesi@0:  *     - callback: A function name to invoke for 'datatype'.
danielebarchiesi@0:  *     - type: A string used to determine the type of RDFa markup which will be
danielebarchiesi@0:  *       used in the final HTML output, depending on whether the RDF object is a
danielebarchiesi@0:  *       literal text or another RDF resource.
danielebarchiesi@0:  *     - rdftype: A special property used to define the type of the instance.
danielebarchiesi@0:  *       Its value should be an array of RDF classes.
danielebarchiesi@0:  *
danielebarchiesi@0:  *       @ingroup rdf
danielebarchiesi@0:  */
danielebarchiesi@0: function hook_rdf_mapping() {
danielebarchiesi@0:   return array(
danielebarchiesi@0:     array(
danielebarchiesi@0:       'type' => 'node',
danielebarchiesi@0:       'bundle' => 'blog',
danielebarchiesi@0:       'mapping' => array(
danielebarchiesi@0:         'rdftype' => array('sioct:Weblog'),
danielebarchiesi@0:         'title' => array(
danielebarchiesi@0:           'predicates' => array('dc:title'),
danielebarchiesi@0:         ),
danielebarchiesi@0:         'created' => array(
danielebarchiesi@0:           'predicates' => array('dc:date', 'dc:created'),
danielebarchiesi@0:           'datatype' => 'xsd:dateTime',
danielebarchiesi@0:           'callback' => 'date_iso8601',
danielebarchiesi@0:         ),
danielebarchiesi@0:         'body' => array(
danielebarchiesi@0:           'predicates' => array('content:encoded'),
danielebarchiesi@0:         ),
danielebarchiesi@0:         'uid' => array(
danielebarchiesi@0:           'predicates' => array('sioc:has_creator'),
danielebarchiesi@0:           'type' => 'rel',
danielebarchiesi@0:         ),
danielebarchiesi@0:         'name' => array(
danielebarchiesi@0:           'predicates' => array('foaf:name'),
danielebarchiesi@0:         ),
danielebarchiesi@0:       ),
danielebarchiesi@0:     ),
danielebarchiesi@0:   );
danielebarchiesi@0: }
danielebarchiesi@0: 
danielebarchiesi@0: /**
danielebarchiesi@0:  * Allow modules to define namespaces for RDF mappings.
danielebarchiesi@0:  *
danielebarchiesi@0:  * Many common namespace prefixes are defined in rdf_rdf_namespaces(). However,
danielebarchiesi@0:  * if a module implements hook_rdf_mapping() and uses a prefix that is not
danielebarchiesi@0:  * defined in rdf_rdf_namespaces(), this hook should be used to define the new
danielebarchiesi@0:  * namespace prefix.
danielebarchiesi@0:  *
danielebarchiesi@0:  * @return
danielebarchiesi@0:  *   An associative array of namespaces where the key is the namespace prefix
danielebarchiesi@0:  *   and the value is the namespace URI.
danielebarchiesi@0:  *
danielebarchiesi@0:  * @ingroup rdf
danielebarchiesi@0:  */
danielebarchiesi@0: function hook_rdf_namespaces() {
danielebarchiesi@0:   return array(
danielebarchiesi@0:     'content'  => 'http://purl.org/rss/1.0/modules/content/',
danielebarchiesi@0:     'dc'       => 'http://purl.org/dc/terms/',
danielebarchiesi@0:     'foaf'     => 'http://xmlns.com/foaf/0.1/',
danielebarchiesi@0:     'og'       => 'http://ogp.me/ns#',
danielebarchiesi@0:     'rdfs'     => 'http://www.w3.org/2000/01/rdf-schema#',
danielebarchiesi@0:     'sioc'     => 'http://rdfs.org/sioc/ns#',
danielebarchiesi@0:     'sioct'    => 'http://rdfs.org/sioc/types#',
danielebarchiesi@0:     'skos'     => 'http://www.w3.org/2004/02/skos/core#',
danielebarchiesi@0:     'xsd'      => 'http://www.w3.org/2001/XMLSchema#',
danielebarchiesi@0:   );
danielebarchiesi@0: }
danielebarchiesi@0: 
danielebarchiesi@0: /**
danielebarchiesi@0:  * @} End of "addtogroup hooks".
danielebarchiesi@0:  */