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   Well-formed and valid

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  • From: David Megginson <david@megginson.com>
  • To: xml-dev <xml-dev@ic.ac.uk>
  • Date: 07 Jan 2000 21:53:49 -0500

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).
> Hmm, we now have the class of invalid, but namespace conformant
> documents. I recall hearing rather clear assertions to the contrary
> post-REC. Evidently the winds have changed on this question.

C'mon, this is getting silly.  The XML 1.0 REC formally defines two
classes of documents:

  1. Well-formed.
  2. Well-formed and valid.

Any XML document without a DOCTYPE declaration is invalid by
definition, but if it is still well-formed XML, most XML-based specs
(including RDF, XSL, DOM, SAX, DocBook, XMI, Namespaces, etc. etc.)
can work with it.

It is reasonable to argue that allowing two classes of XML documents
was a mistake, but if so, it was a mistake made in the XML 1.0 REC,
not in the Namespaces REC.

All the best,


David Megginson                 david@megginson.com

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