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openRDF.org Forum » AliBaba & Elmo: Help » Thread: elmo superclasses

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Feb 26, 2008 3:32:56 PM

jtheuer
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Joined: Feb 11, 2008
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elmo superclasses

A few weeks ago I compiled a rdf file.
After a deeper look at the generated classes I found that:

	<rdf:Description rdf:about="http://scot-project.org/scot/ns#Tag" rdfs:label="Tag">
		<rdfs:comment>A class for describing an individual tag</rdfs:comment>
		<rdf:type rdf:resource="http://www.w3.org/2000/01/rdf-schema#Class"/>
		<rdfs:subClassOf rdf:resource="http://www.w3.org/2004/02/skos/core#Concept"/>
		<rdfs:isDefinedBy rdf:resource="http://scot-project.org/scot/ns#"/>
	</rdf:Description>

is generated as:

** A class for describing an individual tag */
@rdf("http://scot-project.org/scot/ns#Tag")
public interface Tag  {

Shouldn't the java class extend skos:Concept? And where is that class? elmo-codegen did not complain about missing it, so I thought it is provided by elmo?

Jan
Jan

Jan

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Feb 26, 2008 7:56:35 PM

james
OpenRDF.org Consultant

Canada
Joined: Jul 21, 2005
Posts: 650
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Re: elmo superclasses

SKOS support was planned, but was dropped because for technical reasons. As it turns out only the concepts were dropped, but the ontology (as of beta2) is still being distributed.

You didn't receive the an error because the concepts jar does include the skos schema, but since the skos concepts do not exist - Tag has no super class.

You may have trouble building skos using the beta2 concept jar. You will need to edit the /META-INF/org.openrdf.elmo.ontologies file inside the jar and removed the line containing skos. If you have trouble, I can post a corrected version of the jar file.
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