RDF Mapping API

Functions to describe entities and bundles in RDF.

The RDF module introduces RDF and RDFa to Drupal. RDF is a W3C standard to describe structured data. RDF can be serialized as RDFa in XHTML attributes to augment visual data with machine-readable hints.

Modules can provide mappings of their bundles' data and metadata to RDF classes and properties. This module takes care of injecting these mappings into variables available to theme functions and templates. All Drupal core themes are coded to be RDFa compatible.

Example mapping from node.module:

    'type' => 'node',
    'bundle' => RDF_DEFAULT_BUNDLE,
    'mapping' => array(
      'rdftype' => array('sioc:Item', 'foaf:Document'),
      'title' => array(
        'predicates' => array('dc:title'),
      'created' => array(
        'predicates' => array('dc:date', 'dc:created'),
        'datatype' => 'xsd:dateTime',
        'callback' => 'date_iso8601',
     'body' => array(
        'predicates' => array('content:encoded'),
      'uid' => array(
        'predicates' => array('sioc:has_creator'),
      'name' => array(
        'predicates' => array('foaf:name'),

See also



Functions & methods

hook_rdf_mappingmodules/rdf/rdf.api.phpAllow modules to define RDF mappings for field bundles.
hook_rdf_namespacesmodules/rdf/rdf.api.phpAllow modules to define namespaces for RDF mappings.
rdf_get_namespacesmodules/rdf/rdf.moduleReturns an array of RDF namespaces defined in modules that implement hook_rdf_namespaces().
rdf_mapping_deletemodules/rdf/rdf.moduleDeletes the mapping for the given bundle from the database.
rdf_mapping_loadmodules/rdf/rdf.moduleReturns the mapping for attributes of a given entity type/bundle pair.
rdf_mapping_savemodules/rdf/rdf.moduleSaves an RDF mapping to the database.
rdf_rdfa_attributesmodules/rdf/rdf.moduleBuilds 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,…
rdf_rdf_namespacesmodules/rdf/rdf.moduleImplements hook_rdf_namespaces().
theme_rdf_metadatamodules/rdf/rdf.moduleReturns HTML for a series of empty spans for exporting RDF metadata in RDFa.
theme_rdf_template_variable_wrappermodules/rdf/rdf.moduleReturns HTML for a template variable wrapped in an HTML element with the RDF attributes.


RDF_DEFAULT_BUNDLEmodules/rdf/rdf.moduleRDF bundle flag: Default bundle.


modules/rdf/rdf.module, line 21
Enables semantically enriched output for Drupal sites in the form of RDFa.