Add dcterms:isPartOf useful for getting the system URL from a book's RDF

Author: craigdietrich

system/application/config/rdf.php

@@ -62,6 +62,7 @@
 		'has_version' =>			'dcterms:hasVersion',
 		'version_of' =>				'dcterms:isVersionOf',
 		'has_part' =>				'dcterms:hasPart',
+		'is_part_of' =>				'dcterms:isPartOf',
 		'references' => 			'dcterms:references',
 		'has_reference' =>			'dcterms:isReferencedBy',
 		'replaces' =>				'dcterms:replaces',

system/application/models/book_model.php

@@ -70,6 +70,7 @@ public function rdf($row, $base_uri='') {
 
   		if (!isset($row->type) || empty($row->type)) $row->type = 'book';
   		if (isset($row->subtitle) && !empty($row->subtitle)) $row->title = $row->title.'<span class="subtitle">: '.$row->subtitle.'</span>';
+  		if (!isset($row->is_part_of)) $row->is_part_of = base_url();
   		return parent::rdf($row, $base_uri);
 
   	}