[topicmapmail] Could <instanceOf> in a <Topic> element be duplicate to used?

[家維]

To whom it may concern:
Could <instanceOf> in a <Topic> element be duplicate to used? like code 
below：
<topic id="陳家維">
 <instanceOf>
   <topicRef xlink:href="#學生" /> 
 </instanceOf>
 <instanceOf>
   <topicRef xlink:href="#研究生" /> 
 </instanceOf>
 <baseName>
   <baseNameString>陳家維</baseNameString> 
 </baseName>
 <baseName>
  <scope><topicRef xlink:href="#English Name" /></scope>
  <baseNameString>Vince Chen</baseNameString> 
 </baseName>
</topic>

I have studyied XTM specification for this, and it show a part of code in XTM 
DTD like this :
<! ELEMENT topic
 (instanceOf*, subjectIdentity?, (baseName | occurrence)*)
>
Is it mean I can use many <instanceOf> elment in a <topic> elment?

Sincerely Yours
                      Vince Chen


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