rdfapi-php-interest

[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.
-- 


Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

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
>
>
> Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
> Ideal f=FCr Modem und ISDN: http://www.gmx.net/de/go/smartsurfer
>
> Using Tomcat but need to do more? Need to support web services, =20
> security?
> Get stuff done quickly with pre-integrated technology to make your =20
> job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache =20
> Geronimo
> http://sel.as-us.falkag.net/sel?=20
> cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D121642
> _______________________________________________
> Rdfapi-php-interest mailing list
> Rdf...@li...
> https://lists.sourceforge.net/lists/listinfo/rdfapi-php-interest
>

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
>>>
>>>
>>> Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
>>> Ideal f=FCr Modem und ISDN: http://www.gmx.net/de/go/smartsurfer
>>>
>>> Using Tomcat but need to do more? Need to support web services,
>>> security?
>>> Get stuff done quickly with pre-integrated technology to make your
>>> job easier
>>> Download IBM WebSphere Application Server v.1.0.1 based on Apache
>>> Geronimo
>>> http://sel.as-us.falkag.net/sel?
>>> cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D121642
>>> _______________________________________________
>>> Rdfapi-php-interest mailing list
>>> Rdf...@li...
>>> https://lists.sourceforge.net/lists/listinfo/rdfapi-php-interest
>>>
>
> --=20
>
>
> Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
> Ideal f=FCr Modem und ISDN: http://www.gmx.net/de/go/smartsurfer
>