W3C home > Mailing lists > Public > public-prov-wg@w3.org > November 2012

Re: ISSUE-595: Prov-xml subtyping needs to be marked in the document

From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
Date: Tue, 20 Nov 2012 06:33:49 +0000
To: Stephan Zednik <zednis@rpi.edu>
CC: Provenance Working Group <public-prov-wg@w3.org>
Message-ID: <3EF70F23-D841-4F17-8CFF-1D4EE90054D8@ecs.soton.ac.uk>
Hi Stephan,

I think I concur with your conclusion: it may end up making tooling complex. Plus, the third way of writing things:

<proc:agent xsi:type="prov:Person" prov:id="ex:e"/>

Professor Luc Moreau
Electronics and Computer Science
University of Southampton 
Southampton SO17 1BJ
United Kingdom

On 20 Nov 2012, at 01:09, "Stephan Zednik" <zednis@rpi.edu> wrote:

> 
> 
> On Nov 19, 2012, at 5:36 PM, Luc Moreau <L.Moreau@ecs.soton.ac.uk> wrote:
> 
>> Hi Stephan,
>> 
>> It looks like a reasonable approach. Can we handle the case where a quotation is also a revision? Or a person also an organisation? ( not sure ths is all very meaningful, but this is valid).
> 
> If I remember correctly that was one of the modeling issues that lead us to follow the PROV-N lead on sub-typing.
> 
> The following is still valid
> 
> <prov:person prov:id="ex:foo" >
>  <prov:type xsi:type="xsd:QName">prov:Organization</prov:type>
> </prov:person>
> 
> I left prov:type as it was so all previous PROV-XML examples are still valid.   The 'a now b' examples from my previous email should be considered equivalent.  We now have two ways of declaring something is a person, revision, quotation, etc. whereas before we only had one.
> 
> This seems like it would complicate tooling so I am not sure it as cut-and-dry the best direction as it would first seem.
> 
> --Stephan
> 
>> 
>> Professor Luc Moreau
>> Electronics and Computer Science
>> University of Southampton 
>> Southampton SO17 1BJ
>> United Kingdom
>> 
>> On 20 Nov 2012, at 00:02, "Stephan Zednik" <zednis@rpi.edu> wrote:
>> 
>>> I have made notes in the PROV-XML Note document that examples of sub-typing are under discussion and may change in the future.
>>> 
>>> https://dvcs.w3.org/hg/prov/rev/78a059d12dd2
>>> 
>>> I have also created a copy of the existing schema with new complexTypes and elements for Person, Organization, SoftwareAgent, Collection, EmptyCollection, Plan, Revision, Quotation, and PrimarySource.
>>> 
>>> https://dvcs.w3.org/hg/prov/raw-file/49d63187fb7f/xml/schema/prov.alt.xsd
>>> 
>>> This is to address feedback raised on reliance on prov:type to express the above entity and derivation sub-typing.
>>> 
>>> The new complex types use xs:extension to extend existing complexTypes.  
>>> 
>>> Two examples:
>>> 
>>> <xs:complexType name="Person">
>>>  <xs:complexContent>
>>>    <xs:extension base="prov:Agent">
>>>    </xs:extension>
>>>  </xs:complexContent>
>>> </xs:complexType>
>>> 
>>> ...
>>> 
>>> <xs:complexType name="Revision">
>>>  <xs:complexContent>
>>>    <xs:extension base="prov:Derivation">
>>>      <!-- add any additional properties here -->
>>>    </xs:extension>
>>>  </xs:complexContent>
>>> </xs:complexType>
>>> 
>>> These changes lead to the following simplifications on our XML serialization:
>>> 
>>> <prov:agent prov:id="ex:Paolo">
>>>  <prov:type xsi:type="xsd:QName">prov:Person</prov:type>
>>> </prov:agent>
>>> 
>>> could now be modeled as
>>> 
>>> <prov:person prov:id="ex:Paolo" />
>>> 
>>> and
>>> 
>>> <prov:wasDerivedFrom>
>>>  <prov:generatedEntity prov:ref="tr:WD-prov-dm-20111215"/>
>>>  <prov:usedEntity prov:ref="tr:WD-prov-dm-20111018"/>
>>>  <prov:type xsi:type="xsd:QName">prov:Revision</prov:type>
>>> </prov:wasDerivedFrom>
>>> 
>>> could now be modeled as
>>> 
>>> <prov:wasRevisionOf>
>>>  <prov:generatedEntity prov:ref="tr:WD-prov-dm-20111215"/>
>>>  <prov:usedEntity prov:ref="tr:WD-prov-dm-20111018"/>
>>> </prov:wasRevisionOf>
>>> 
>>> What does the group think of this approach?
>>> 
>>> --Stephan
>>> 
>>> On Nov 9, 2012, at 11:53 AM, Provenance Working Group Issue Tracker <sysbot+tracker@w3.org> wrote:
>>> 
>>>> ISSUE-595: Prov-xml subtyping needs to be marked in the document
>>>> 
>>>> http://www.w3.org/2011/prov/track/issues/595
>>>> 
>>>> Raised by: 
>>>> On product: 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
> 
Received on Tuesday, 20 November 2012 06:34:24 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 20 November 2012 06:34:25 GMT