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<?php
// $Id$

/**
 * @file
 * This is an example outlining how a module can be used to define RDF mappings.
 * We define mappings for a node type defined in this module.
 */

/**
 * Implements hook_rdf_mapping().
 *
 * This hook should only be used to define the RDF mapping for an entity or
 * bundle that has been defined by this module. On installation, this mapping
 * will be saved to the database. To alter anything in this mapping after module
 * installation (or to alter bundles defined in another module), the RDF CRUD
 * functions should be used.
 */
function rdf_example_rdf_mapping() {
  return array(
    'recipe' => array(
      'type' => 'node',
      'bundle' => 'recipe',
      'mapping' => array(
        'rdftype' => array('v:Recipe'),
        // We don't use the default bundle mapping for title. Instead, we add
        // the v:name property. We still want to use dc:title as well, though,
        // so we include it in the array.
        'title' => array(
          'predicates' => array('dc:title', 'v:name'),
        ),
        'recipe_summary' => array(
          'predicates' => array('v:summary'),
        ),
        // The photo URI isn't a string but instead points to a resource, so we
        // indicate that the attribute type is rel. If type isn't specified, it
        // defaults to property, which is used for string values.
        'recipe_photo' => array(
          'predicates' => array('v:photo'),
          'type' => 'rel',
        ),
        'recipe_nutrition' => array(
          'predicates' => array('v:nutrition'),
          'type' => 'rel',
        ),
      ),
    ),
    'nutrition' => array(
      'type' => 'field_collection_item',
      'bundle' => 'recipe_nutrition',
      'mapping' => array(
        'rdftype' => array('v:Nutrition'),
        'recipe_serving_size' => array(
          'predicates' => array('v:servingSize'),
        ),
        'recipe_calories' => array(
          'predicates' => array('v:calories'),
        ),
      ),
    ),
  );
}

/*
 * Implements hook_rdf_namespaces().
 *
 * This hook should be used to define any prefixes used by this module that are
 * not already defined in core by rdf_rdf_namespaces.
 *
 * http://api.drupal.org/api/drupal/modules--rdf--rdf.api.php/function/hook_rdf_namespaces/7
 */
function rdf_example_rdf_namespaces() {
  return array(
    // Google's namespace for their custom vocabularies.
    'v' => 'http://rdf.data-vocabulary.org/#', 
  );
}