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Subject: Re: [topicmaps-comment] mapping topic maps on a relation database
* Lars Marius Garshol | | BTW, how far did you get with TouchGraph visualization? I tried it | out myself briefly (a 1-hour Jython hack on top of our engine), and | while it did very well for small topic maps (5-40 topics) it didn't | do at all well for larger things like the Italian Opera topic | map. Have you been able to get round that problem somehow? (I have | some ideas about how to do it, but would be curious to hear yours.) * Murray Altheim | | Send me the LTM file and I'll see what it does. The Italian Opera topic map only exists as XTM at the moment: <URL: http://www.ontopia.net/omnigator/docs/opera.xtm > If you want an LTM file you can use i18n.ltm (which is LTM 1.2): <URL: http://www.ontopia.net/omnigator/docs/i18n.ltm > | As I mentioned, merging isn't completely functional (eg., it | currently doesn't merge associations at all, or topics playing the | same role in associations), but it does do most. That shouldn't make any difference for these two topic maps. None of them make any use of merging, as far as I can remember. | As for size, I've hit limits on memory before there's real problems. | I've opened up ITIS files with hundreds of topics, so there | shouldn't be a problem with 5-40. No, I didn't have problems with 5-40, but opera.xtm has 893 and i18n.ltm has 634, and in these cases TouchGraph just made a big mess with lots of topics on top of each other connected all ways. That was the problem I was thinking of. | [I'd hoped to have Ceryle ready for release this week, but it's | looking now like next week... still some missing functionality and a | few bugs I want to kill before a first viewing.] I'm looking forward to having a look at it. There's enough topic map engines out there now (OKS, K42, Mondeca, Nexist, TM4J, XTM::Base, tmproc, Ceryle, XTME, and probably some more) that getting an XTM test suite out is getting quite important. -- Lars Marius Garshol, Ontopian <URL: http://www.ontopia.net > ISO SC34/WG3, OASIS GeoLang TC <URL: http://www.garshol.priv.no >
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