[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: SAX2 Namespace Support
Hunter, David writes: > > > The problem though boils down to how often, in reality, XML > > > instances will have the same Namespace declared twice, with > > > different prefixes. > > > > The fact that the bug would be rare makes it worse -- an > > application will run perfectly for, say, 18 months, then will > > suddenly and inexplicably blow up long after the original > > programmers have moved on because one input document happened to > > declare the same NS twice and the programmers didn't build in > > error recovery for that problem. > > I don't want to flog any dead horses, so I hope this hasn't been covered > already, but is it really an error to have the same namespace declared > twice, with different prefixes? No, it's not an error at all. We're concerned about the borderline case where there are two QName objects {"http://www.w3c.org/1999/xhtml", "p", ""} {"http://www.w3c.org/1999/xhtml", "p", "html"} and a program compares them with equals() in Java or == in C++. Most people are arguing that the two should be equals()/==, but a few people have pointed out that that is a nasty trap for any programmer who is not extremely familiar with the Namespaces spec. My proposed solution is simply to punt: don't introduce a QName class in SAX2, and leave such things to higher-level specs, which can deal with these as they see fit. All the best, David -- David Megginson david@m... http://www.megginson.com/ 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 unsubscribe, mailto:majordomo@i... the following message; unsubscribe 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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