[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Mixed Content Models
* Jerome McDonough | | I've inherited a DTD for development that was originally intended to | be an SGML DTD, and has been converted to XML. Contained within it | is the following: | | <!ELEMENT qstn (#PCDATA | (preQTxt?, qstnLit?, postQTxt?, forward?, | backward?, ivuInstr*))* | | Is this a legitimate content model under XML section 3.2.2? No, it is not. XML mixed content models must be of the form <!ELEMENT qstn (#PCDATA | child1 | child2 | child3 ...)*> | Msxml doesn't have a problem with it, MSXML is not updated to the latest specification. | and nsgmls using the -wxml flag also happily parses the DTD. Hmmm. This deviation is not documented in the SP documentation. | IBM's xml4j, however, complains: | "Codebook.dtd: 1256, 33: This content model is not matched with the | mixed model '(#PCDATA|FOO|BAR|. . .|BAZ)*': '(#PCDATA|(preQTxt?, qstnLit?, | postQTxt?,forward?,backward?,ivuInstr*))*". This is correct behaviour. (Note that it also gives an example of a correct mixed content model.) | I suppose this boils down to, should the parser ignore what's within | a content group when evaluating whether someone is trying to | constrain the order or number of occurrences of 'child elements.' | If the only 'child elements' to be considered in the above case are: | | A. #PCDATA, and | B. (preQTxt?, qstnLit?, postQTxt?, forward?, backward?, ivuInstr*) | | then the above content model simplies to (A | B)* and doesn't appear | to conflict with section 3.2.2. Well, it does, you see, because it conflicts with the grammar, so this is actually a well-formedness error. | But if 'child elements' means any element, even those within a | group, then my content model is probably bogus. Can someone tell me | which is the correct interpretation? Your content model is bogus. :) --Lars M. 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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