[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XSchema Spec Section 2.2, Draft 1
At 20:05 23/06/98 +0100, Michael Kay wrote: >>Peter Murray-Rust wrote: >> >>> Unless there is >>> sensible running text whose prime purpose is to be read >by humans there is >>> no particular value in having mixed content (i.e. strings >+ elements mixed). I probably didn't mean to make it sound so black and white :-) >> >Counter-example from GedML (adapted to make it >self-explanatory): > ><PERSON> ><NAME>Frederick BLOGGS > <SOURCE>Birth Certificate</SOURCE> > <CONFIDENCE>High</CONFIDENCE> > <CHANGED> > <ON>12 Jan 1983</ON> > <BY>MHK</BY> > </CHANGED> > <NOTE>Generally signed himself "Frederik"</NOTE> ></NAME> > There's nothing wrong with this, of course. My own style would be to wrap 'Frederick Bloggs' into an element. In implementation terms I have implemented PCDATA as a sort of second-class element - i.e. it gets displayed differently in JUMBO, etc. Methods of linking to it are different. Perhaps I'm wrong here. >Unfortunately I am unable to declare in the DTD that the >element contains "PCDATA content followed by zero or more of >the following child elements", XML's peculiar rules mean >that with mixed content I cannot declare any ordering or >cardinality constraints. (I wonder if someone thought that >there was no requirement?) It was to avoid the problems of pernicious mixed content, I believe. Remember also that: <PERSON> <NAME> <SOURCE>Birth Certificate</SOURCE> <CONFIDENCE>High</CONFIDENCE> <CHANGED> <ON>12 Jan 1983</ON> <BY>MHK</BY> </CHANGED> <NOTE>Generally signed himself "Frederik"</NOTE> </NAME> is a valid instance of a document against your DTD. The person's name is then or something similar P. Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic net connection VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary http://www.venus.co.uk/vhg 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/ 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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