Re: Parameter entities for DTD modularity (was: Re: Multiple docs in 'wr
On Sun, 31 Oct 1999, John Tigue wrote: > Another alternative could be implemented now based solely on > XML 1.0. Consider using external parameter entity references. During the XML design phase, I felt that the SYSTEM (and PUBLIC identifiers in the document type declaration should have been dispened with, <!DOCTYPE Sock SYSTEM "hosiery.dtd" [ <!ENTITY myName "Lam"> ]> is more or less the same (in XML, not SGML) as <!DOCTYPE Sock [ <!ENTITY myName "Lam"> <!ENTITY % theDTD STYSTEM "hosiery.dtd"> %theDTD; ]> The extra syntax in the 2nd example is outweighed by the fact you'd probably need inclusions anyway, and having just one syntax is simpler. Furthermore, the first example is confusing: "hosiery.dtd" gets included *after* the declaration of myName in both cases, but you'd think this not to be the case in the first example, unless you had read the spec. The main advantage would be that people would be more familiar with how to include DTD fragments in XML! Most people learn the DOCTYPE/STSTEM method, ad fewer learn the external parameter entity reference. It's too late to remove the featur now, but people writing tutorials and books and examples for XML would do well to consider introducing the second before the first, I think. Lee -- Liam Quin, Barefoot Computing, Toronto; The barefoot agitator l i a m q u i n at i n t e r l o g dot c o m Ankh on irc.sorcery.net http://www.interlog.com/~liamquin/ 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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