Altering an existing RDF mapping

Because RDF mappings are saved to the database on installation, hook_rdf_mapping should only be used in modules that create new bundles.

Otherwise, to alter an existing mapping, use the RDF mapping CRUD API. This consists of the following functions:

• rdf_mapping_load($type, $bundle = RDF_DEFAULT_BUNDLE)
• rdf_mapping_save($mapping)
• rdf_mapping_delete($type, $bundle)