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Michael Champion wrote: > CONCEPTUALLY (not syntactically, politically, religiously, or > organizationally), what are the similarities and and the differences among > XTM topic maps, XLink link bases, and RDF knowledge bases (or whatever the > correct term for a "web" of RDF is)? Here's my take on it, which surely is not complete and may not be 100% correct. By "resources" I mean the W3C sense: anything which has an URI. 1) RDF expresses *binary relations* between *resources*, and also relations between a resource and a literal string. 2) XLink expresses *multi-way* relations (with role labels) between resources, and also specifies preferred traversal paths (arcs) between the related resources. 3) XTM expresses multi-way relations (with role labels) between *topics*, where topics represent subject matters, which may be either themselves resources or non-addressable objects (like people) who can be described by resources. Each has its own idiosyncratic XML syntax. Because RDF is the lowest level of the three, it should be possible to express both XLink and XTM in RDF syntax as well as native syntax. -- There is / one art || John Cowan <jcowan@r...> no more / no less || http://www.reutershealth.com to do / all things || http://www.ccil.org/~cowan with art- / lessness \\ -- Piet Hein
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