[topicmapmail] Number types per occurrence

[Knud Möller]

Hi!

I hope this hasn't been asked before; but I couldn't find the answer to  
the following question:
Why does XTM only allow one type per occurrence or association  
(considering that topics can have any number)?
If I e.g. wanted to express that a resource which is indicated in an  
<occurrence>-tag is both of type "text" and "official document", how  
would I do that? Obviously I can't use <instanceOf> within  
<occurrence>. A solution that comes to mind is to reify the resource  
(not the occurrence) with a topic and then type that topic. Would that  
be correct?

<topic id="something">
	...
	<occurrence>
		<resourceRef xlink:href = "interesting.doc"/>
	</occurrence>
</topic>

<topic id="theDocument">
	<instanceOf>
		<topicRef xlink:href="#resTypeText"/>
	</instanceOf>
	<instanceOf>
		<topicRef xlink:href="#resTypeOfficial"/>
	</instanceOf>
	<subjectIdentity>
		<subjectIndicatorRef xlink:href="interesting.doc"/>
	</subjectIdentity>
	...
</topic>

Thanks for your time,

Knud
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Knud Möller -  Institut für Sprachliche Informationsverarbeitung,
Universität zu Köln
(Department of Linguistic Data Processing,
University of Cologne, Germany)