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

[Michele P. <mic...@gm...>]

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