RE: [TM4J-users] problems during writing xtm files with tm4j

[Kal A. <ka...@te...>]

Hi Thomas,

The way that the TM4J parser works means that some topics that aren't
represented by <topic> element will get created in the data model held
internally by TM4J. Typically, these get created when a <topic> element has
a <subjectIndicatorRef> element anywhere in it other than inside a
<subjectIdentity> element. These <subjectIndicatorRef> elements are
references to subjects which TM4J automatically turns into topics. On the
new topics being created, is there a
<subjectIdentity>/<subjectInidicatorRef> element ? If so, then this is the
reason.

Also, TM4J creates the XTM-specified class-instance association type and
class and instance role types by default - these are needed because TM4J
attempts to honour the XTM requirement that <instanceOf> on a topic is
actually equivalent to an association between the topic containing the
<instanceOf> and the topic referenced from the <instanceOf>.

I'm not sure why the name did not get updated properly (I take it that you
mean that you changed the baseNameString in the <topic> element which
specifies the <topicMap> element as its <subjectIndicatorRef> ?). I'll try
and track that problem down and let you know what I find.

Cheers,

Kal

> -----Original Message-----
> From: tm4...@li...
> [mailto:tm4...@li...]On Behalf Of Thomas
> Schwotzer
> Sent: 17 July 2001 13:28
> To: tm4...@li...
> Subject: [TM4J-users] problems during writing xtm files with tm4j
>
>
> Hi,
> yesterday I downloaded version 0.4.3.
>
> I plan to generate a VRML scenario
> from a topic map. I would like
> to use tm4j to read and write xtm files.
>
> Reading works fine. I could read a topic
> map, count some topics etc. I used two
> XTM files from Ontopia (opera.xtm and jill.xtm)
> for testing.
>
> Writing was more difficult.
> I simply changed the name of the topic map
> and used XTMWriter and Walker for writing.
> I could produce another xtm file...
>
> But this new copy did not contain the new
> name but it contained 11 additional topics.
> I run the small program several times - every
> time 11 topics were added.
>
> My question is: Is it a known bug?
> What could I have done wrong?
> Are there some examples?
>
> Thanks in advance, thomas
>
> ps: Despite these problems: as far as I
> can see your class lib is currently the best free
> Java TM lib world wide.
> --
> Thomas Schwotzer
> Technische Universität Berlin
> Intelligente Netze und Management verteilter Systeme
> http://ivs.tu-berlin.de/~thsc
> fon: +49-30-314-25102 mobile: +49-172-8719509
>
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