Simple XML conformance

[David Brownell]

John Cowan wrote:
> 
> Peter Murray-Rust scripsit:
> 
> >       - tool threw a fatal error because <!DOCTYPE was missing
> 
> The XML Rec does not forbid a parser to treat validation errors as fatal.

But -- a missing DTD isn't a validation error.  No validity
constraint says "there must be a DTD".

The validation errors start coming in when the content uses
names that aren't declared ... first one will be the root element.

It's not that subtle a point; the syntax is optional, but if you
don't use it you will certainly run into validity errors.

- Dave

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