Validity question

Chris Maden crism at
Fri Jan 2 19:48:04 GMT 1998

[Sean McGrath]
> Is this document VALID xml?
> <?XML version = "1.0"?>
> !DOCTYPE foo [
> !ELEMENT foo (bar+)>
> ]>
> <foo>
> <bar/>
> </foo>
> There is a validity constraint in section 3.2 to the effect that it
> is not an error to have an element type mentioned in a content model
> that is not declared anywhere. But is it an error if the document
> proceeds to use the undeclared element type?
> msxml thinks it is valid. nsgmls does not.
> Opinions?

Opinions, nothing.  Fact: PR-xml-971208 has, after production [46],
"VC: Element Valid.  An element is valid if there is a declaration
matching elementdecl ([45]) where the Name matches the element type,
and one of the following holds:..."  Since there is no elementdecl
whose name matches "bar", the <bar/> element is invalid.  (Personally,
I think this VC belongs in 3.1, not 3.2, and have said so to the

Tip 1: If a document is not valid SGML (post-WebSGML), it's probably
not valid XML.  Hunt around in the spec.  If it is, the XML spec
probably needs fixing.

Tip 2: If nsgmls says that a document is not valid SGML, it probably
is not.

<!ENTITY crism PUBLIC "-//O'Reilly//NONSGML Christopher R. Maden//EN"
"<URL> <TEL>+1.617.499.7487
<USMAIL>90 Sherman Street, Cambridge, MA 02140 USA" NDATA SGML.Geek>

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