[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML DTD vs. XML-Data
1. You can do enumeration-based validation using attributes in your DTD, e.g. <!ELEMENT primary_colour EMPTY> <!ATTLIST primary_colour name (red|blue|green) "red"> You might be able to use one of the schema proposals (XSchema, SOX, DCD which probably supersedes XML-Data), but I think they're all weak in this area from my limited skimming of their current drafts. The RDF proposal certainly has the power to handle all kinds of data typing, but RDF is pretty complicated. 2. Different schema proposals had different goals in respect to convertibility back and forth to DTDs. Ron Bourret's excellent slide show (with extensive annotations) discusses these issues. See the presentation at: HTML: http://www.informatik.tu-darmstadt.de/DVS1/staff/bourret/xml/xmlschemas/inde x.htm PowerPoint: http://www.informatik.tu-darmstadt.de/DVS1/staff/bourret/xml/xmlschemas/XMLS chemas.ppt Jeff -----Original Message----- From: Tiago Moitinho de Almeida <tma@c...> To: XML Dev <xml-dev@i...> Date: Thursday, February 18, 1999 9:22 AM Subject: XML DTD vs. XML-Data ... >1. >Two important issues about the validation are: >- data type checking (ex: the content of <date> tags should have a valid date >format) >- validity domains (ex: for the content of <primary_colour> I should only >accept "blue", "red" or "green"). > >As far as I undertand, XML-Data provides solution for the 1st issue, and I can >work arround it in a DTD using a #FIXED attribute for those element >declarations. > >However, I don´t see how XML-data or XML DTD provide information to meet the 2nd >issue. > > >2. >2 questions about XML DTD's and XML-Data: >- Can I use DTD to do everything that XML-Data does? >- Using XML-Data, can I somehow get rid of XML DTD's? > 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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