Get the full graph of terms and properties to display.
When an RDF term URI is dereferenced, it usually contains a description of the term in RDF. To make it easier to use this description, include information about all related terms. For example, when viewing the RDF description for the RDF class which corresponds to a Drupal bundle, data about its fields would also be included.
array An array of terms and their properties, keyed by term URI.
public function getGraph();