Re: Ensuring Assertions are identified

Hi,

What are the arguments for or against each of the following approaches?


1. Sub classing External Vocabulary
Create EARL vocabulary that are subclasses of existing vocabulary. For example:

<rdfs:Class rdf:about="&earl;Person" rdfs:label="A human assertor">
  <rdfs:subClassOf rdf:resource="&foaf;Person"/>
</rdfs:Class>


2. Equality with External Vocabulary
Create EARL vocabulary and use OWL constraints to define equality with existing vocabulary. For example:

<rdfs:Class rdf:about="&earl;Person" rdfs:label="A human assertor">
  <owl:equivalentClass rdf:resource="&foaf;Person"/>
</rdfs:Class>

<rdfs:Class rdf:about="&earl;Person" rdfs:label="A human assertor">
  <owl:sameAs rdf:resource="&foaf;Person"/>
</rdfs:Class>


Regards,
  Shadi


Charles McCathieNevile wrote:
> 
> Hi folks,
> 
> it seems that there is nothing in OWL, RDFS or RDF that lets us enforce 
> a  constraint that an Assertion is identifiable.
> 
> We can find Assertions that don't have an identifier by using a SPARQL  
> query with the filter isBlank(). Then there is a question of how to 
> deal  with this.
> 
> It may be possible in OWL to say that the class of ValidAssertions is  
> disjoint with the class of things that can be found by a SPARQL query, 
> by  defining our own terms. We could also perhaps use the log:uri 
> property  developed by TimBL for CWM
> 
> [[
> uri
>     This allows one to look at the actual string of the URI which 
> identifies  this. (Cwm can get the URI of a resource or get the resource 
> from the  URI.) This is a level breaker, breaking the rule of not 
> looking inside a  URI. Use (eg with string:match) to replace RDF's old 
> "aboutEach"  functionality. Use to implement the URI spec and protocol 
> specs, etc.
> ]] - http://www.w3.org/2000/10/swap/doc/CwmBuiltins
> 
> I think that we should just suggest that doing this is a best practice,  
> and tools MAY provide a warning (for example something like the  
> interoperability analyser of Libby's that Jim pointed to last week.
> 
> cheers
> 
> Chaals
> 

-- 
Shadi Abou-Zahra,       Web Accessibility Specialist for Europe 
World Wide Web Consortium (W3C),             http://www.w3.org/ 
Web Accessibility Initiative (WAI),      http://www.w3.org/WAI/ 
IST WAI-TIES Project (WAI-TIES)     http://www.w3.org/WAI/TIES/ 
Evaluation and Repair Tools (ERT WG), http://www.w3.org/WAI/ER/ 
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Received on Thursday, 19 May 2005 14:13:06 UTC