[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Another look at namespaces
Simon St.Laurent wrote: > We seem to have fallen into linguistics. And the problem with that is what exactly? :-) Rick Jelliffe wrote: > >> Again, Andrew is simply conflating schema and namespace. The idea that > >> he and Tim are putting forward is that a language is defined by a single > >> set of content models; this confuses "language" with "grammar" Paul Prescod wrote: > >What definition of language are you using that does NOT state that every > >language has one and only one grammar. Is there a book I can read that > >defines it? The SGML Cookbook doesn't count. Simon St.Laurent wrote: > I could start with H.L. Mencken's _The American Language_ (Fourth Edition > with Supplements, 1948), in particular a citation of Noah Webster, in 1789: > (second supplement, p. 333) Simon, you are talking about natural languages whereas Paul is talking about formal languages. A formal language is a set of valid utterances. A (formal) grammar is a collection of rules for generating that set of utterances. Mind you, the notion of a formal grammar for a natural language is largely due to Chomsky and you've already said you were never fond of him :-) But that aside, XML is a formal language, not a natural one. Likewise, HTML 4.0 is (despite what anyone says) three separate (formal) languages. In the case of HTML 4.0, the three share a common vocabulary, but they are separate languages. <aside>Namespaces, by the REC's definition, are about vocabularies, not languages.</aside> [...] > "They seem not to consider that grammar is formed on language, and not language on grammar." > That last sentence seems to summarize the problem we're having here. Both "grammar" and "language" as they are used in this quote predate formal notions by quite a few years! I think Noah Webster's point is merely that linguistics should be descriptive, not perscriptive (first lesson in Linguistics 101) However, that point is misleading at best when applied to formal languages. In particular: * XML is a language defined by a grammar. * The XML REC clearly says that a DTD is a grammar for a class of documents. In a formal language view, this class of documents is a set of utterances---a formal language. > Whether or not _The SGML Cookbook_ makes this claim that a language is not > constrained to a single grammar, I'll be making that claim in my next book, Depending on what you mean by "not constrained to" and what type of languages you mean, I either completely agree or completely disagree with you :-) James -- James Tauber / jtauber@j... / www.jtauber.com Maintainer of : www.xmlinfo.com, www.xmlsoftware.com and www.schema.net <pipe>Ceci n'est pas une pipe</pipe> 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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