[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: [Q] How should SAX support Namespaces?
Peter Murray-Rust wrote: > [I]f we can find a SEPARATOR which is > guaranteed not to occur in a URN it just makes it a bit easier (this is > DavidM's #2 but with something other than COLON). [It never sees the light > of day, anyway]. Dagger! \U2020! Dagger! > <?jumbo:namespace ns="http://xml-cml.org" prefix="CML" > java="jumbo.cml.%sNode"> > where localPart (with initial capitalises letter) replaces %s. Thus > CML:Molecule is mapped to jumbo.cml.MoleculeNode. When a common mechanism > is agreed this PI can be disabled. The trouble here IMHO is that this mapping is app-specific, not really document-specific. You will want to load various Java classes depending on what you want to *do* to a particular element: edit it, render it, translate its content into HTML, ... > The problem I face is with other specs (especially XPointer). These will > have to be revised to fit namespaces, since I think relying on a prefix in > a given document may be very dangerous. Thus I'd like to be able to search > for <CML:Molecule> in a document using XPointer but cannot rely on the > 'CML'. [I know that some people say XPointer shouldn't be used for such > 'searches' but my will is weak.] I think you are over-generalizing. The point of namespace PIs is to let you realize that my FOO:BAR is your BAZ:BAR, because my FOO prefix has the same namespace URI as your BAZ prefix. So your document can refer to some element of mine as BAZ:BAR, and a proper XLL engine will actually return FOO:BAR. There is no need, IMHO, to handle the case that you insist on finding literally "BAZ:BAR" as an element name. > I wonder whether namespace-aware DTD software has to add defaults on the > basis of Universal names and not element types. Thus: > > <?xml:namespace ns="http://xml-cml.org" prefix="CML"?> > <?xml:namespace ns="http://xml-cml.org" prefix="ChemML"?> > <!DOCTYPE CML [ > <!ATTLIST CML:Molecule title CDATA #FIXED "A molecule"> > ]> > <CML> > <ChemML:Molecule>...</ChemML> > </CML> > > What attributes does the <ChemML:Molecule> element have?? None! DTD processing is SGML-compatible and namespace-blind. To DTD-based software, CML:Molecule and ChemML:Molecule are as different as A and \U0391 (GREEK CAPITAL LETTER ALPHA). -- 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/ 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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