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- From: "Frank Boumphrey" <bckman@ix.netcom.com>
- To: "David Megginson" <david@megginson.com>, "xml-dev" <xml-dev@ic.ac.uk>
- Date: Sat, 8 Jan 2000 23:19:00 -0500
> 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@megginson.com>
To: xml-dev <xml-dev@ic.ac.uk>
Sent: Saturday, January 08, 2000 9:37 AM
Subject: Re: Well-formed and valid
> "Frank Boumphrey" <bckman@ix.netcom.com> writes:
>
> > > james anderson <James.Anderson@mecomnet.de> 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@megginson.com
> http://www.megginson.com/
>
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