Re: [Rdfapi-php-interest] How to avoid duplicates rdf entities?

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Hey Tom,

sorry about the 'node' class, i'm so used to it I don't find it confusing
anymore. So here's a simplified example in PHP, which you can easily run by
yourself. Basically all I'm trying to write is 3 triples as follows:

($ID ---> rdf:TYPE -----> "http://cohereweb.net/ontology/cohere.owl#node")
($authorID ---> rdf:TYPE -----> "
http://cohereweb.net/ontology/cohere.owl#cohere_user")
($ID ---> ""http://cohereweb.net/ontology/cohere.owl#has_creator" ----->
$name)

And here's the code:
........................................

get_result("myID", "myName", "myAuthorID");

function get_result ($ID, $Name, $authorID) {

    loadRapLibraries("../import/rdfapi-php/api/");

    define('COHERE_NS', 'http://cohereweb.net/ontology/cohere.owl#');
    $Model = ModelFactory::getDefaultModel(RDFS_VOCABULARY);
    $Model->setBaseURI(COHERE_NS);

    $newclaimID = new Resource(COHERE_NS . $ID);
    $newauthor = new Resource(COHERE_NS . $authorID);

    $statement1 = new Statement ($newclaimID, RDF_RES::TYPE(), new Resource
("http://cohereweb.net/ontology/cohere.owl#node"));
    $statement2 = new Statement ($newauthor, RDF_RES::TYPE(), new Resource
("http://cohereweb.net/ontology/cohere.owl#cohere_user"));
    $statement3 = new Statement ($newclaimID, new Resource ("
http://cohereweb.net/ontology/cohere.owl#has_creator"), $newauthor);

    $Model->addWithoutDuplicates($statement1);
    $Model->addWithoutDuplicates($statement2);
    $Model->addWithoutDuplicates($statement3);

    $ret = $Model->writeAsHtml();
    return $ret;

}

...........................................

the rdf I get is (without namespaces):

<ns1:node rdf:ID="myID"/>

<ns1:cohere_user rdf:ID="myAuthorID"/>

<rdf:Description rdf:ID="myID">
   <ns1:has_creator rdf:resource="#myAuthorID"/>
</rdf:Description>

which is wrong because the  [rdf:ID="myID"/>] is redefined in the first
statement and the third one. I guess it should be something like
[rdf:about='myID"/>] in the third one.. but i'm no expert here!!

Anyways, a simple workaround is that if you just change the order of the
statements added (putting the statement 2 first) the whole thing works. That
is, from:

    $Model->addWithoutDuplicates($statement1);
    $Model->addWithoutDuplicates($statement2);
    $Model->addWithoutDuplicates($statement3);

to

    $Model->addWithoutDuplicates($statement2);
    $Model->addWithoutDuplicates($statement1);
    $Model->addWithoutDuplicates($statement3);

Then the resulting RDF is valid:

<ns1:cohere_user rdf:ID="myAuthorID"/>

<ns1:node rdf:ID="myID">
   <ns1:has_creator rdf:resource="#myAuthorID"/>
</ns1:node>

Hope it's clearer now.... any idea where I'm getting it wrong?

Tx a lot

mik

On Wed, Apr 2, 2008 at 10:09 AM, Tom Heath <tom...@gm...> wrote:

> Hey Mik,
>
> With the "node" property in your own namespace it's quite hard to work
> out what you're actually trying to say. Any chance you can show us an
> example of the triples you'd like to generate, perhaps as n-triples,
> and then it'll be easier to debug the PHP.
>
> It's probably also worth using CamelCase for class names in your
> ontology, as this is a widely used convention and makes the RDF more
> readable.
>
> Cheers,
>
> Tom.
>
> On 01/04/2008, Michele Pasin <mic...@gm...> wrote:
> > Hi all,
> >
> > I'm getting this error with the MemModel - when adding properties to a
> > resource which has been previously created, instead of getting the
> rdf:About
> > ...ResourceID  construct, the output is rdf:ID='ResourceID'. Not sure
> > whether it's an error or not, but the w3cRDF-validator apparently says
> so:
> >
> >
> >
> > Error: {W105} Redefinition of ID: node_node1[Line = 20, Column = 38]
> > Error: {W105} Previous definition of 'node_node1'.[Line = 16, Column =
> 32]
> >
> >
> > Here's the complete RDF code I've generated:
> >
> > ;;;;;;;;;;;;;;;;;;;;;;;;
> > <?xml version="1.0" encoding="UTF-8" ?>
> >  <!-- Generated by RdfSerializer.php from RDF RAP.
> > #
> > http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/index.html
> > !-->
> >
> > <rdf:RDF
> >     xml:base="http://cohereweb.net/ontology/cohere.owl#"
> >    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
> >     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
> >    xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
> >     xmlns:owl="http://www.w3.org/2002/07/owl#"
> >    xmlns:dc="http://purl.org/dc/elements/1.1/"
> >    xmlns:dcterms="http://purl.org/dc/terms/"
> >     xmlns:vcard="http://www.w3.org/2001/vcard-rdf/3.0#"
> >    xmlns:ns1="http://cohereweb.net/ontology/cohere.owl#">
> >
> > <ns1:node rdf:ID="node1"/>
> >
> > <ns1:cohere_user rdf:ID="michele"/>
> >
> > <rdf:Description rdf:ID="node1">
> >    <ns1:has_creator rdf:resource="#michele"/>
> >  </rdf:Description>
> >
> > </rdf:RDF>
> > ;;;;;;;;;;;;;;;;;;;;;;;;;;
> >
> >
> >
> > And here's the PHP code:
> >
> >
> > ................
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > //test function
> >
> > function get_result2 ($nodeID, $nodeName, $nodeDescription, $authorID) {
> >
> >         //load all it's necessary
> >
> >  loadRapLibraries("../import/rdfapi-php/api/");
> >
> >
> >
> >
> >         //create a new model
> >
> >  $model = getCohereModel();
> >
> >
> >
> >          //create resources using my own vocabulary
> >
> >  $newnode = new Resource(COHERE_NS . $nodeID);
> >
> >  $newauthor = new Resource(COHERE_NS . $authorID);
> >
> >
> >
> >          // create statements
> >
> >  $statement1 = new Statement ($newnode, RDF_RES::TYPE(),
> > COHERE_RES::NODE());
> >
> >
> >
> >
> >  $statement2 = new Statement ($newauthor, RDF_RES::TYPE(),
> > COHERE_RES::COHERE_USER());
> >
> >
> >
> >  $statement3 = new Statement ($newnode, COHERE_RES::HAS_CREATOR(),
> > $newauthor);
> >
> >
> >
> >          //add the statements
> >
> >  $model->addWithoutDuplicates($statement1);
> >
> >
> >
> >
> >  $model->addWithoutDuplicates($statement2);
> >
> >
> >
> >  $model->addWithoutDuplicates($statement3);
> >
> >
> >
> >  $ret = $model->writeAsHtml();
> >
> >  return $ret;
> >
> > }
> >
> >
> >
> >
> >
> >
> >  echo get_result2("node1", "myNode", "myDesc", "michele");
> >
> >
> >
> >
> >
> >
> >
> >
> > ................
> >
> >
> >
> >
> >
> >
> >
> > I can't figure out where the mistake is - can anybody help please?
> > Thanks a lot,
> > mikele
> >
> >
> >
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