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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Well-formed and valid
 > Wrong. A document type needs to conform to the specification that > defines it: the specification Of course David is quite right! I should have said that a document must conform to a schema, and that a schema can be a DTD, or a 'schema' or a narative description, etc. ... Frank ----- Original Message ----- From: David Megginson <david@m...> To: xml-dev <xml-dev@i...> Sent: Saturday, January 08, 2000 9:37 AM Subject: Re: Well-formed and valid > "Frank Boumphrey" <bckman@i...> writes: > > > > james anderson <James.Anderson@m...> writes: > > > > > > > > ... it is possible to have a document that is well-formed but > > > > > not valid XML 1.0, but still conforms to Namespaces, RDF, or XLink > > > > > (though not XHTML, which requires validity for strict conformance). > > > > Well XHTML is no different from any other _document type_. A document type > > such as docbook or XHTML must conform to a DTD or it would not be a document > > type! > > Wrong. A document type needs to conform to the specification that > defines it: the specification may or may not include a DTD, and may or > may not require the DTD to be used, but the DTD is at best an optional > (if extremely useful) part of a document type specification. > > Here's an example of a document type whose specification does not > include a DTD: > > Memo Document Type > ------------------ > > Every memo document consists of a root element named "memo" > with two element children: "number" and "body", optionally separated > by whitespace. The contents of the "number" element shall be a > number between 1 and 99,999, assigned sequentially; the contents of > the "body" element shall be text containing a minimum of one and a > maximum of three sentences, using UK orthography. > > Here's a document conforming to that document type: > > <?xml version="1.0"?> > > <memo> > <number>2,126</number> > <body>Look, mum, no DTD!</body> > </memo> > > Now, I could have written a DTD and required its use as *part* of the > document type specification: > > <!ELEMENT memo (number, body)> > <!ELEMENT number (#PCDATA)> > <!ELEMENT body (#PCDATA)> > > However, it would be trivially easy to write documents that conform to > the DTD but not to the document type: > > <?xml version="1.0"?> > > <!DOCTYPE memo SYSTEM "memo.dtd"> > > <memo> > <number>Let me not to the marriage of true minds</number> > <body>123</body> > </memo> > > > > All the best, > > > David > > -- > David Megginson david@m... > http://www.megginson.com/ > > 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...) > 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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