Non-Validating XML Parsers: Requirements

John Cowan cowan at
Tue Aug 4 20:47:13 BST 1998

David Brownell wrote:

>         - Validating Parsers
>         - Nonvalidating Parsers that read external definitions
>         - Nonvalidating Parsers that don't read those definitions
> Point being that as section 5.2 makes clear, some WF errors will
> not be reported by the third category of parser, but must be
> reported by the other two.

I think, however, that NVPs may read some external entities (the
DTD external subset, say) but not others (like the content of
external general entities).
> That'd be "SHALL NOT" ... but I think that a parser which
> has read the external DTD entities MUST report as a WF error
> such problems.   See the XML specification in section 5.2, which
> is explicit that this is a WF error AND that it's not consistently
> reported.

No, it means "MAY fail to" or "MAY or may not".
> > 7.  An NVP MAY NOT signal an error if a reference is made to an
> > unparsed entity, if the entity was declared in some external entity.
> As above -- this is a "MUST" if the parser reads external entities.
> and a "MUST NOT" elsewhere.

Unless it reads some e.e.s but not others.
John Cowan		cowan at
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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