[Rdfapi-php-interest] rdf:type

[Michael M. <za...@gm...>]

Hi,
Im trying to implement a php-script which generates RDF-Files with data form a local database containing infromation about publications. My rdf-file should look like this:
<rdf:Description rdf:about="http://swrc.ontoware.org/m1">
  <rdf:type>
		<owl:Class rdf:about="http://swrc.ontoware.org/ontology#Publication"/>
	</rdf:type>
	<dc:creator>Me</dc:creator>
   <dc:title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">A multi-agent platform for a corporate semantic web.</dc:title>
   <dc:description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">We describe the technical choices and the design of a multi-agents\nsoftware architecture to manage a corporate memory in the form\nof a corporate semantic web. We then present our approach to\ntackle a distributed memory and distributed queries.</dc:description>
	</rdf:Description>
but when I try to add the rdf:type-tag to my model, I get the following error message: 
Fatal error: Call to undefined method Literal::getURI() in /var/www/rdfapi-php/api/util/RdfUtil.php on line 63

My php-code looks like this:
$publication = new Resource('http://l3s.de/publication/'.$ergebnis[$i]->dblp_key); 
			$pub_title = DC::TITLE();
			$pub_source = DC::SOURCE();
			
			
			$statement0 = new Statement($publication, RDF::TYPE(), new Literal(""));
			$statement1 = new Statement($publication, $pub_title, new Literal ($ergebnis[$i]->title));
			$statement2 = new Statement($publication, $pub_source, new Literal ($ergebnis[$i]->source));
	
			
	
			$model->add($statement0);
			$model->add($statement1);
			$model->add($statement2);

I cannot find any mistake in my code, please help me.
-- 


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