[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: inclusions/exclusions/named groups
Andrea Anders wrote: > 1) Neither SGML-inclusions nor -exclusions are allowed in XML!? How can I > express this in XML? Inclusions and exclusions cannot be expressed by model group constructs (except for a very few cases). As model groups describe and therefore affect an element's content, and therefore are a DTD-based concept, exceptions describe and affect the complete element subtree, and therefore are a document-instance-based concept. Best you can do is to merge inclusions into the model groups of all elements it 'intends to affect' (typically by defining parameter entities), which would extent over all elements occurring in the model of the element you intended the inclusion to work on (and elements in the model of those elements, etc.). To alter the model group for exclusions requires you to re-think the complete set of parameter entities used in the original DTD; you have to make certain that the element you want excluded does not occurr in any model after entities are resolved. Unsupporting exceptions is the toll we pay for allowing standard parser generators to be used to build XML systems. Arjan. 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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