Re: PROV-O in LOV : URI, namespace and versions

Hi Bernard,
just to complement Paul's message:
In PROV all the concepts defined within the documents share the same
namespace (http://www.w3.org/ns/prov#).
www.w3.org/ns/prov-o is a link to a file with the subset of concepts
defined by PROV-O, that's all.

For example www.w3.org/ns/prov-dc links to another file for the subset
defined in the prov-dc mapping and www.w3.org/ns/prov-aq
links to another file with the subset of concepts defined in prov-aq.
But within those files, all concepts share the same namespace.

I hope this helps.
Best,
Daniel


2013/6/17 Paul Groth <p.t.groth@vu.nl>

> Hi Bernard
>
> The URL of PROV is http://www.w3.org/ns/prov#
>
> Do content negotiation to get the RDF representation.
>
> Your done - nothing more to do.
>
> Regards
> Paul
>
> On Jun 17, 2013, at 19:25, Bernard Vatant <bernard.vatant@mondeca.com>
> wrote:
>
>  Hi Tim and all
>
>  Thanks for the feedback. Not much time to parse all your answers right
> now, I will be back on this on Wednesday.
>
>  Quick answer for now. You wrote
>
>   30 <http://www.w3.org/ns/prov#>
>   31     a owl:Ontology .
>
>  1237 <http://www.w3.org/ns/prov-o#>
> 1238     a owl:Ontology ;
>
>  HA! The LOV-Bot (and myself) did not parse down to the second
> owl:Ontology declaration, because it assumes there should be only one such
>  ... but seems to me this is adding to the pile of issues rather than
> anything. Why the first declaration, then?
>
>  You wrote :
>
> "http://www.w3.org/ns/prov-o and http://www.w3.org/ns/prov are
> owl:Ontologies."
>  and later on
>
> "Could you explain why you would expect http://www.w3.org/ns/prov-o to be
> a owl:Ontology?"
> and finally
>
> "http://www.w3.org/ns/prov-o provides the resource representation of the
> owl:Ontology http://www.w3.org/ns/prov-o# <http://www.w3.org/ns/prov-o#-o>
> "
>
>  Now I'm totally confused ... I have to munch over all this, but  all LOV
> architecture is based on discovering the ontology URI (here it seems to be
> http://www.w3.org/ns/prov-o# <http://www.w3.org/ns/prov-o#-o> and not
> http://www.w3.org/ns/prov-o but I'm not sure) from de-referencing its
> namespace http://www.w3.org/ns/prov#
>  If you tell me the configuration you have enables to do that and that
> there is no possible ambiguity, please help us to understand how so that we
> can improve the LOV-Bot behavior accordingly ...
>
> The bottom line is that after two years of work on this, hundreds of
> vocabulary URI and namespaces parsed, dozens of different conneg
> configurations found, and so many discussions and exchanges with so many
> SemWeb gurus, we're still enable to settle this issue properly.
>
>  And yours is yet another configuration ...
>
>  More to come (have to pack for my night train)
>
>  Bernard
>
>
> 2013/6/17 Timothy Lebo <lebot@rpi.edu>
>
>> Hi, Bernard,
>>
>>  I'm cc'ing the prov comments list to archive your comments.
>>
>>  @PROV-WG, I might need help refreshing on our provenance-of-provenance
>> design to fulfill Bernard's needs)
>> @Ivan, we have a 404 on http://www.w3.org/ns/prov-o-20120312 but it
>> needs to be there like http://www.w3.org/ns/prov-o-20130430 is)
>> @PROV-WG-chairs, are we still able to (or should we) use the tracker?
>>
>>  I respond within...
>>
>>  On Jun 17, 2013, at 9:32 AM, Bernard Vatant <bernard.vatant@mondeca.com>
>> wrote:
>>
>>   Hi Tim and Daniel
>>
>>  I updated today the LOV record for PROV-O [1]. Actually this should have
>> been done well before, but the new version(s) had not been captured by the
>> LOV-Bot, due mainly to a confusing (for me and the LOV-Bot at least)
>> namespaces and URI policy.
>>  I have several issues with this (important) vocabulary.
>>
>>
>>  Thanks for reporting your challenges with consuming the PROV namespace.
>> If PROV doesn't suit LOV, then it's a clear indicator that we aren't
>> following common practice.
>> I hope we can clear up the issues, either on your side or on ours.
>> I've started a section on the semweb wiki to document your questions and
>> their answers: http://www.w3.org/2001/sw/wiki/PROV-FAQ#The_PROV_URIs
>>
>>
>>  As I write in the vocabulary "review" : " Note that the namespace of the
>> vocabulary is http://www.w3.org/ns/prov#, but its URI is
>> http://www.w3.org/ns/prov-o. But the RDF file declares <
>> http://www.w3.org/ns/prov#> a owl:Ontology, which seems confusing at
>> least."
>>
>>
>>
>>  yes, the namespace of the vocabulary is http://www.w3.org/ns/prov#
>>
>>  http://www.w3.org/ns/prov-o and http://www.w3.org/ns/prov are
>> owl:Ontologies.
>>
>>  From the comment itself, I'm not sure what is confusing. Could you
>> elaborate? (or, do the following three cover your concerns?)
>>
>>
>>
>>  ... In more details :
>>
>> 1. The namespace http://www.w3.org/ns/prov# does not dereference to the
>> ontology, but to a general documentation page about various documents using
>> the namespace, including the ontology itself.
>>
>>
>>  Yes.
>>
>>  How am I supposed to GET the RDF description of e.g.,
>> http://www.w3.org/ns/prov#Activity, from the namespace URI?
>>
>>
>>  In short, use content negotiation.
>>
>> http://www.w3.org/2001/sw/wiki/PROV-FAQ#GET.27ing_an_RDF_description_of_a_PROV_term
>>
>> curl -H "Accept: application/rdf+xml" -L http://www.w3.org/ns/prov
>>
>>
>>
>>
>> 2. In the RDF at http://www.w3.org/ns/prov-o I read  <
>> http://www.w3.org/ns/prov#> a owl:Ontology
>>  one should expect  <http://www.w3.org/ns/prov-o> a owl:Ontology seems
>> to me …
>>
>>
>>  There are two instances of owl:Ontology, at lines:
>>
>>    30 <http://www.w3.org/ns/prov#>
>>   31     a owl:Ontology .
>>
>>  1237 <http://www.w3.org/ns/prov-o#>
>> 1238     a owl:Ontology ;
>>
>>  Could you explain why you would expect http://www.w3.org/ns/prov-o to
>> be a owl:Ontology?
>>
>>  As it stands, http://www.w3.org/ns/prov-o provides the resource
>> representation of the owl:Ontology http://www.w3.org/ns/prov-o#<http://www.w3.org/ns/prov-o#-o>
>>
>>
>>
>>  3. The previous versions (Candidate Recommandation and Proposed
>> Recommendation) are available as HTML documentation, but the respective RDF
>> versions are not available.
>>
>>
>>
>>
>>
>>
>>   The link to the OWL version redirects to the current version.
>>
>>
>>  Yes, to restate: http://www.w3.org/TR/2013/PR-prov-o-20130312/ points
>> to http://www.w3.org/ns/prov-o in "The OWL encoding of the PROV Ontology
>> is available here <http://www.w3.org/ns/prov-o>."?
>>
>>  The RDF representations for those versions are sitting around, so if
>> you could describe in more detail how you'd like to be able to access them,
>> perhaps we can update the provenance-of-provenance to
>> suit your use case.
>>
>>  From within http://www.w3.org/ns/prov-o,  the owl:versionIRI and
>> prov:wasDerivedFrom are intended to provide access to the previous versions.
>> But, I'm seeing a 404! :-)
>>
>>
>>  <http://www.w3.org/ns/prov-o#>
>>     a owl:Ontology ;
>>     rdfs:comment """This document is published by the Provenance Working
>> Group (http://www.w3.org/2011/prov/wiki/Main_Page).
>>
>>  If you wish to make comments regarding this document, please send them
>> to public-prov-comments@w3.org (subscribe
>> public-prov-comments-request@w3.org, archives
>> http://lists.w3.org/Archives/Public/public-prov-c
>> omments/). All feedback is welcome."""@en ;
>>     rdfs:label "W3C PROVenance Interchange Ontology (PROV-O)"@en ;
>>     rdfs:seeAlso <http://www.w3.org/TR/prov-o/>, <
>> http://www.w3.org/ns/prov> ;
>>     owl:versionIRI <http://www.w3.org/ns/prov-o-20130430> ;
>>     owl:versionInfo "Recommendation version 2013-04-30"@en ;
>>     :specializationOf <http://www.w3.org/ns/prov-o> ;
>>     :wasRevisionOf <http://www.w3.org/ns/prov-o-20120312> .
>>
>>
>>  Thanks again for your comments. I hope that we can iron out some of the
>> wrinkles that you ran into.
>>
>>  Regards,
>> Tim Lebo
>>
>>
>>
>>
>> Thanks for any clarification. I understand that since we deal now with a
>> W3C Recommandation, if anything needs to be fixed, the process is likely to
>> be long :)
>>
>>  Best regards
>>
>>
>> [1] http://lov.okfn.org/dataset/lov/details/vocabulary_prov-o.html
>>
>>
>>  *Bernard Vatant
>> *
>> Vocabularies & Data Engineering
>> Tel :  + 33 (0)9 71 48 84 59
>>  Skype : bernard.vatant
>> Blog : the wheel and the hub <http://bvatant.blogspot.com/>
>>  Linked Open Vocabularies : lov.okfn.org
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>>
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