RE: An occurrence example. (was: Re: [xtm-wg] ANNOUNCE: Update of XTM Repository (new XTM prototype DTD))

["Kal Ahmed" <kal@ontopia.net>]

> [Kal Ahmed:]
> > ... what is the meaning of this ?
> >
> > <topic>
> > 	<baseName>techquila.com</baseName>
> > 	<occurrences>
> > 		<resource>
> > 			<scope>
> > 				<topicRef xlink:href="#some-topic"/>
> > 			</scope>
> > 			<topicRef
> xlink:href="http://www.techquila.com/" referent="isSubject"/>
> > 		</resource>
> > 	</occurrences>
> > </topic>
>
[SRN]
> It means two things:
>
> (1) The subject of this topic is the information found at
>     http://www.techquila.com.  (Not what that information describes;
>     the information itself, because you said referent="isSubject"
>     rather than referent="describesSubject".)  Any other <topic>s that
>     have the same subject will be merged with this one.
>
Checking my understanding here. The <scope> makes no difference. If I have
another <topic> with the same subject contained in an occurrence which has a
different scope, then the merge will still take place. Right ?

> (2) The information found at http://www.techquila.com is an occurrence
>     of the topic, within a scope that apparently, from your example,
>     consists of two topic nodes:
>
>     (a) The topic node that corresponds to the <topic> whose address
>         is "#some-topic".  Or, if #some-topic is not the address of a
>         <topic>, but instead it's the address of something that's not
>         a <topic>, then it's the topic node that is called into
>         existence by virtue of the fact that you used a <topicRef> to
>         point at it, whose subject is whatever the information object
>         found at "#some-topic" describes.  (I say "describes", rather
>         than "is", because the default value of the -referent-
>         attribute of <topicRef> is "describesSubject", and you didn't
>         specify a -referent- attribute on the <topicRef> in your
>         <scope> element.)
>
>     (b) The topic node that corresponds to the XTM-defined subject,
>         "subject descriptor is subject".  (Not the XTM-defined
>         subject, "subject descriptor describes subject", because you
>         said referent="isSubject", rather than
>         referent="describesSubject".)
>

OK - I didn't appreciate the full identity/occurrence duality here.

I now understand what you say to mean that the subject has no scope but the
occurrence which is used to specify the subject or subject descriptor does
have scope and one theme (sorry for using that word...old habits die
hard...) in that scope which has a subject defined in XTM.

Cheers,

Kal


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