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Re: review of prov-xml

From: Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk>
Date: Fri, 1 Mar 2013 16:24:31 +0000
Message-ID: <CAPRnXtkw_H+AcJL7Zq2mEn9pfq6E08iZREGd8Hf38YYiZYM6jw@mail.gmail.com>
To: Luc Moreau <l.moreau@ecs.soton.ac.uk>
Cc: Stephan Zednik <zednis@rpi.edu>, W3C provenance WG <public-prov-wg@w3.org>
Right, this is fine then, as PROV-DM requires:


> A namespace ◊ is identified by an IRI

and as xmlns="" is not an IRI, then it's against PROV-DM (but not
PROV-N which allows IRI-ref).

Then I propose we don't need to worry about the empty namespace in
PROV-XML either and can leave both as is.


On Fri, Mar 1, 2013 at 9:08 AM, Luc Moreau <l.moreau@ecs.soton.ac.uk> wrote:
> Hi Stian,
>
>
> On 03/01/2013 02:16 AM, Stian Soiland-Reyes wrote:
>>
>> On Thu, Feb 28, 2013 at 5:26 PM, Luc Moreau <L.Moreau@ecs.soton.ac.uk>
>> wrote:
>>>
>>> Thanks  Stian.
>>> My preference would be to avoid these since in provdm the prefix should
>>> denote a uri.
>>
>> I would still allow qnames without prefix as xmlns="somethinguseful"
>> is very commonly used in XML. QNames with unknown prefixes is
>> (already) not allowed. You suggest we should also require the XML
>> namespace for identifier qnames to be non-empty - is that true for any
>> prefix then?
>
> Yes absent prefix, but default namespace is also fine. I didn't state the
> rule in full.
> Also concatenating the uri denoted by prefix and local name should give a
> uri.
> See http://www.w3.org/TR/prov-dm/#term-qualified-name
>
> Luc
>
>
>>
>> In PROV-N, this is allowed, thanks to IRI_REF allowing empty strings
>> and relative IRI references. (Perhaps this was not intended?)
>>
>> document
>>    default <>
>>    prefix ex1 <>
>>    prefix ex2 <../soup#>
>>    entity(fred)
>>    entity(ex1:fred)
>>    entity(ex2:soup)
>> endDocument
>>
>> But with your suggestion I can only express ex2:soup in PROV-XML.
>>
>>
>> As a side note, PROV-N does not define how to resolve relative IRI
>> references according to the base IRI of the PROV-N. This might be
>> important to clarify inside bundles.  (I think they should be resolved
>> according to the document resource's requested/known IRI, not the
>> bundle's identifier)
>>
>
> --
> Professor Luc Moreau
>
> Electronics and Computer Science   tel:   +44 23 8059 4487
> University of Southampton          fax:   +44 23 8059 2865
> Southampton SO17 1BJ               email: l.moreau@ecs.soton.ac.uk
> United Kingdom                     http://www.ecs.soton.ac.uk/~lavm
>



-- 
Stian Soiland-Reyes, myGrid team
School of Computer Science
The University of Manchester
Received on Friday, 1 March 2013 16:25:26 UTC

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