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