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Re: [dxwg] Current https://raw.githubusercontent.com/w3c/dxwg/gh-pages/dcat/rdf/dcat.ttl is inconsistent (#944)

From: Chris Mungall via GitHub <sysbot+gh@w3.org>
Date: Wed, 17 Jul 2019 18:29:11 +0000
To: public-dxwg-wg@w3.org
Message-ID: <issue_comment.created-512514152-1563388149-sysbot+gh@w3.org>
I think you need to declare primaryTopic to be an OP

This works as expected:

```
@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix dctype: <http://purl.org/dc/dcmitype/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix odrl: <http://www.w3.org/ns/odrl/2/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sdo: <http://schema.org/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix time: <http://www.w3.org/2006/time#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

foaf:primaryTopic a owl:ObjectProperty .

dcat:CatalogRecord  rdfs:subClassOf [
        rdf:type owl:Restriction ;
       owl:cardinality "1"^^xsd:nonNegativeInteger ;
       owl:onProperty foaf:primaryTopic ;
    ] .
```  

however, omitting the declaration causes the parse error.   

I believe this is consistent with the specs:

https://www.w3.org/TR/owl2-mapping-to-rdf/

Sometimes the owlapi will infer these declarations but this isn't guaranteed. Missing OP declarations is a common source of errors, especially when trying to repurpose ontologies that were designed to be RDFS as OWL ontologies.

-- 
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Please view or discuss this issue at https://github.com/w3c/dxwg/issues/944#issuecomment-512514152 using your GitHub account
Received on Wednesday, 17 July 2019 18:29:14 UTC

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