Re: questions concerning RDF/DOM/XML Schema
***Marco Kleefman*** wrote: > Q1: Is statement1 [XML Schema] correct? XML Schema is in its first public working draft, and no one can say for sure how it will come out. In particular, there may be a separation between "lexical" and "syntactic" concerns which both DTDs and the current version of XML Schemas intermingle. > Q2: Does XML Schema has the possibility to describe the logical structure of > a document? Perhaps. This question is very general. > Q3: Is statement2 [DOM] correct? Yes. > Q4: Is statement3 [RDF Schemas] correct? RDF is a model of general metadata, not just structural metadata. It can describe such non-structural questions as author, date of creation, purpose, ... and can apply to non-XML-documents such as photographs, printed books, records in conventional databases, persons, houses, .... > Q5: If XML Schema has the possibility to describe the logical structure of a > document (see Q2), then what is the difference betweeen describing the > logical structure in RDF-Schema or XML Schema? RDF provides property-value pairs about arbitrary resources. RDF Schemas constrain which pairs can apply to which resources. XML Schemas describe structural constraints on XML documents. An XML schema might (if everything were done to that purpose) be construed as a set of RDF statements. An XML schema cannot reasonably be an RDF schema: the universe of discourse is different. > Q5: When you know everything about the physical structure of a document, you > also know already a great deal about the logical structure of a document. Is > this correct? Maybe, maybe not. All (valid) HTML documents share the same known DTD, but may have no semantics in common whatever except a common rendering model. It was for this very purpose that XML was devised. -- John Cowan http://www.ccil.org/~cowan cowan@c... You tollerday donsk? N. You tolkatiff scowegian? Nn. You spigotty anglease? Nnn. You phonio saxo? Nnnn. Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5) xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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