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Subject: Re: [tm-pubsubj-comment] Re: data vs doc

*Bernard Vatant
> | If you want both applications to be able to deal for your subjects
> | set, then you'll have to create both doc-based and data-based PSI
> | sets, and maybe declare equivalence in each Subject Indicator, e.g.,
> | the resource you retrieve at #myTopic somehow declares that it
> | represents the same subject than ?id=myTopic.

*Lars Marius Garshol
> What's the point of this? Why can't you just have a single URI? I
> don't understand this. Having multiple subject identifiers for a
> single subject is the Wrong Thing.

Alas ... the real world is full with wrong things :))

Take the following highly probable scenario:

Publisher A has set a PSD following PubSubj recommendations, with one PSI by subject.
Publisher B, not aware of Publisher A, has done the same in the same domain.

One year later, some topic maps authors have used PSD A and some have used PSD B.
Publishers A and B suddenly meet and discover part of their work is redundant: some of
their subjects are clearly the same.
None of us has made a wrong thing. But together they have made the Wrong Thing. Too bad.
What should they do? Neither can delete anything, because both PSI sets have been used. So
they should have a way to include a declaration of equivalence somewhere.

> | This notion of equivalent PSIs we have really to settle clearly.
> [subject-with-two-indicators
>  @"http://psi.example.com/foo/bar";
>  @"http://psi.ontopia.net/urghle/burghle";]
> Or, if you prefer XTM:
> <?xml version="1.0" encoding="utf-8" standalone="yes"?>
> <topicMap xmlns="http://www.topicmaps.org/xtm/1.0/";
xmlns:xlink="http://www.w3.org/1999/xlink"; id="id0">
>   <topic id="subject-with-two-indicators">
>     <subjectIdentity>
>       <subjectIndicatorRef xlink:href="http://psi.example.com/foo/bar"/>
>       <subjectIndicatorRef xlink:href="http://psi.ontopia.net/urghle/burghle"/>
>     </subjectIdentity>
>   </topic>
> </topicMap>

Where do you put that topic map? Part of the PSD? In the Subject Indicator? Or where?


Bernard Vatant
Consultant - Mondeca
Chair - OASIS TM PubSubj Technical Committee

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