[topicmapmail] Contextualized Topic Maps.

Thu, 25 Mar 2004 14:27:23 +0100

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Murray Altheim wrote: 
<blockquote type="cite" cite="mid4062CEA7.4060401@open.ac.uk">
 <blockquote type="cite"></blockquote>
</blockquote>
<blockquote type="cite" cite="mid4062CEA7.4060401@open.ac.uk">If you check
the note following section B.8 of XTM 1.0's Conceptual Model 
you'll see a clarification, i.e., that any topic characteristic can 
be scoped, but that: 
 
&nbsp; NOTE: In XTM, it is not permissible for the different Roles in 
&nbsp; an Association to be governed by different Scopes. The XTM syntax 
&nbsp; expresses the Scopes on all the Roles of an Association through a 
&nbsp; single &lt;scope&gt; subelement of the &lt;association&gt; element. 
 
Which semantically performs the task correctly, I believe.</blockquote>
Not exactly to me, because we shift form being able to scope each member
participation to being able only to scope all members in one 'single' shot.
That's not only simplification, that's changing the semantic since practically
you are not able anymore to scope separately. 
 
<blockquote type="cite" cite="mid4062CEA7.4060401@open.ac.uk">If you 
think about an example, "John plays the role of husband" in a 
"marriage" association with Frank (to keep up with the times). Now, 
this association can be scoped, say, by time "1998-2003". It 
wouldn't make sense to scope the role itself; it's the association 
that gets scoped (e.g., by time). 
 </blockquote>
As you say it yourself, it's the association that is scoped. Why XTM continues
'pretending' that the Scopes on all the Roles of an Association [are expressed]
through a single &lt;scope&gt; subelement of the &lt;association&gt; element? 
 
I agree that in the example you gave, the whole association looses sense
if one of the member is 'outscoped' but one can easily imagine a use for
scoping each member. Example: the association between a company and its employees
in which each employee is scoped by a period of time, during which it was
employed (to keep up with our times of flexible careers...). 
<blockquote type="cite" cite="mid4062CEA7.4060401@open.ac.uk">Sorry for all
the confusion. I hope this helps. </blockquote>
yes, it does, thank you, 
 
Olivier. 
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