RE: Again wit da AND and Repetitions
John Cowan wrote: "IIRC the canonical way of doing (A & B & C) is to transform it into (A | B | C)* and then do a post-check that each of A, B, C appears exactly once. ..." It seems that this approach would require the parser to perform look ahead for the following content model: ( (A & B & C), C, C, C ) This content model would be transformed into: ( (A | B | C)*, C, C, C ) The transformed content model is non-deterministic. For example, the parser would have to look ahead when parsing the first C in the following input: C B A C C C The original content model is deterministic; the parser would not have to look ahead to determine that the first C (in C B A C C C) matches the (A & B & C) portion of the original content model. Bob ------ Bob Lyons EC Consultant Unidex Inc. 1-732-975-9877 boblyons@u... http://www.unidex.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 (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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