RE: SAX2: Namespace separators
RDF concatenates a namespace's URI plus a local name to form a new URI by simple concatenation, with no intervening separator, true enough, but RDF also imposes a rule that all namespace URIs must end in "/" so that no ambiguity is possible. I think there are two lessons to take from this: 1. It is desirable, perhaps essential for RDF compatibility, that the composition of a namespace's URI plus a local name itself be a URI or URI reference. 2. Careful choice of rules for either naming namespaces or for picking separator characters allows us to avoid ambiguity. Proposals to never have a separator either lead to ambiguity or to imposing restrictions on namespaces. These, therefore, either fail the ambiguity test or fail in the face of many namespace URIs that are legal per the namespaces spec. That is not good. I have seen the following rule proposed, and it appears both robust and compatible with RDF: To compose a namespace's URI plus a local name into a new string that is a URI reference, concatenate the strings directly if the URI ends in "/" or "?", else concatenate the strings but separate them with a "#". 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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