Re: [Rdfapi-php-interest] rdf:type

[Richard C. <ri...@cy...>]

Hi Michael,

On 6 Jul 2006, at 22:25, Michael Mainik wrote:
> Im trying to implement a php-script which generates RDF-Files with =20
> data form a local database containing infromation about =20
> publications. My rdf-file should look like this:
> <rdf:Description rdf:about=3D"http://swrc.ontoware.org/m1">
>   <rdf:type>
> 		<owl:Class rdf:about=3D"http://swrc.ontoware.org/=20
> ontology#Publication"/>
> 	</rdf:type>
> 	<dc:creator>Me</dc:creator>
>    <dc:title rdf:datatype=3D"http://www.w3.org/2001/=20
> XMLSchema#string">A multi-agent platform for a corporate semantic =20
> web.</dc:title>
>    <dc:description rdf:datatype=3D"http://www.w3.org/2001/=20
> XMLSchema#string">We describe the technical choices and the design =20
> of a multi-agents\nsoftware architecture to manage a corporate =20
> memory in the form\nof a corporate semantic web. We then present =20
> our approach to\ntackle a distributed memory and distributed =20
> queries.</dc:description>
> 	</rdf:Description>
> but when I try to add the rdf:type-tag to my model, I get the =20
> following error message:
> Fatal error: Call to undefined method Literal::getURI() in /var/www/=20=

> rdfapi-php/api/util/RdfUtil.php on line 63
>
> My php-code looks like this:
> $publication =3D new Resource('http://l3s.de/publication/'.$ergebnis=20=

> [$i]->dblp_key);
> 			$pub_title =3D DC::TITLE();
> 			$pub_source =3D DC::SOURCE();
> 		=09
> 		=09
> 			$statement0 =3D new Statement($publication, =
RDF::TYPE(), new =20
> Literal(""));

I guess here's the problem. The object (third element) of an rdf:type =20=

statement must be a resource, that is, an URI or a blank node. A =20
literal will not work. (And especially not an empty literal!) You =20
could try something like this:

     $model->add(new Statement($pub, RDF::TYPE(),
         new Resource("http://swrc.ontoware.org/=20
ontology#Publication")));

Best,
Richard



> 			$statement1 =3D new Statement($publication, =
$pub_title, new =20
> Literal ($ergebnis[$i]->title));
> 			$statement2 =3D new Statement($publication, =
$pub_source, new =20
> Literal ($ergebnis[$i]->source));
> =09
> 		=09
> =09
> 			$model->add($statement0);
> 			$model->add($statement1);
> 			$model->add($statement2);
>
> I cannot find any mistake in my code, please help me.
> --=20
>
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