[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Identical production rules
On Mon, 27 Sep 1999, Pierre Morel wrote: > Why the XML specs declare two production rules with identical structure ? > > [30] extSubset ::= TextDecl? extSubsetDecl > > and > > [79] extPE ::= TextDecl? extSubsetDecl > > I don't understand very well the purpose of having two identical production > rules. Neither extSubset nor extPE are used as non-terminals in any other productions; rather they're referred to in the text in statement of the form "foo is well-formed if it matches the production labelled bar." It's just a coincidence of implementation that external subsets and external parameter entities have the same syntax, and the redundancy makes human communication easier. Tim Bray could probably tell us if the redundancy were the result of an earlier draft specifying different syntaxes for the two cases. 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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