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RDDL is a pack o' XLinks. It's a good idea and well done but not a core piece. It is an application language that one may adopt to align pieces just as one might learn Topic Maps. But learn XLinks first and then RDDL/Topic Maps. That is what I mean by moving parts. Write a RDDL if you need one. Write a Topic Map if you need one. Yet the core of web is interoperation. The core set of specs must define that without which interoperability is impossible and no more. Then layer on whatever is needed to do other tasks. The core set should be the first thing one want to master and I have to wonder if RDF is a core piece or yet another application language for knowledge base work. UML is pushed into being a tool for those who want to design OOP systems. Ok, but if one is not required to design OOP, it isn't core. For what kind of system is RDF preferred? To me, it looks like any system that needs a spec'd knowledge base (in the olde AI/Prolog sense of the word). It's a very useful thing. When do I need RDDL? Is the answer, when reading an XML document that has a namespace reference, I can go to identified location and find all the pieces I need to interpret that? Then RDDL is a catalog of relationships among components of some system. Len http://www.mp3.com/LenBullard Ekam sat.h, Vipraah bahudhaa vadanti. Daamyata. Datta. Dayadhvam.h -----Original Message----- From: Simon "St.Laurent [mailto:simonstl@s...] On 30 May 2001 10:55:34 -0500, Bullard, Claude L (Len) wrote: > I have before. We are staring into UML, RDF, Topic Maps, > XML Schemas, now add RDDL, TREX, RELAX, etc. It isn't that any tool > or method alone is hard to grasp, it is the relationships > among them and how to choose when one is best. In other > words, if we dare to do less, we should use less maybe. > > But put it altogether and I think interoperability becomes > a statistical guess. Too many casually aligned parts. RDDL does at least provide an opportunity to gather the rest of the parts and make their alignment explicit. For a nice example, see the RDDL spec itself: http://rddl.org How well the rest of the parts are actually aligned is up to their creators, of course.
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