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

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

On 7 Jul 2006, at 11:21, Michael Mainik wrote:

> Hi,
> tank your for the quick reply. I've already tried it this way but I =20=

> get
> <ns1:Publication>......</ns1:Publication> instead of the =20
> rdf:Description-tag(ns1=3D"http://swrc.ontoware.org/ontology") and =20
> the rdf:type-tag is still missing.

This:

     <ns1:Publication>
         ...
     </ns1:Publication>

is exactly the same as this:

     <rdf:Description>
         <rdf:type rdf:resource=3D"http://...Publication" />
         ....
     </rdf:Description>

The first is just a short form for the second. Both encode exactly =20
the same triples.

(You can use tools like the RDF validator [1] to show the triples =20
encoded in an RDF/XML file. You shouldn't worry about how exactly the =20=

RDF/XML looks. The triples is all that matters, and the many =20
different ways of writing down the same set of triples as RDF/XML are =20=

all equivalent.)

Best,
Richard

[1] http://www.w3.org/RDF/Validator/


>
> Best regards,
> Michael
> -------- Original-Nachricht --------
> Datum: Thu, 6 Jul 2006 22:44:12 +0200
> Von: Richard Cyganiak <ri...@cy...>
> An: Michael Mainik <za...@gm...>
> Betreff: Re: [Rdfapi-php-interest] rdf:type
>
>> Hi Michael,
>>
>> On 6 Jul 2006, at 22:25, Michael Mainik wrote:
>>> 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=3D"http://swrc.ontoware.org/m1">
>>>   <rdf:type>
>>> 		<owl:Class rdf:about=3D"http://swrc.ontoware.org/
>>> ontology#Publication"/>
>>> 	</rdf:type>
>>> 	<dc:creator>Me</dc:creator>
>>>    <dc:title rdf:datatype=3D"http://www.w3.org/2001/
>>> XMLSchema#string">A multi-agent platform for a corporate semantic
>>> web.</dc:title>
>>>    <dc:description rdf:datatype=3D"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:
>>> $publication =3D new Resource('http://l3s.de/publication/'.$ergebnis
>>> [$i]->dblp_key);
>>> 			$pub_title =3D DC::TITLE();
>>> 			$pub_source =3D DC::SOURCE();
>>> 		=09
>>> 		=09
>>> 			$statement0 =3D new Statement($publication, =
RDF::TYPE(), new
>>> Literal(""));
>>
>> I guess here's the problem. The object (third element) of an rdf:type
>> statement must be a resource, that is, an URI or a blank node. A
>> literal will not work. (And especially not an empty literal!) You
>> could try something like this:
>>
>>      $model->add(new Statement($pub, RDF::TYPE(),
>>          new Resource("http://swrc.ontoware.org/
>> ontology#Publication")));
>>
>> Best,
>> Richard
>>
>>
>>
>>> 			$statement1 =3D new Statement($publication, =
$pub_title, new
>>> Literal ($ergebnis[$i]->title));
>>> 			$statement2 =3D new Statement($publication, =
$pub_source, new
>>> Literal ($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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>
> --=20
>
>
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