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>Of course there's probably some niggling technical issue
>that would make that unworkable; the document would be
>"invalid" unless the external subset also contained
>a suitable collection of <!ELEMENT...> and <!ATTLIST...>
>declarations, which will cause validating parsers to
>reject it.

The XML spec requires that validating parsers have a mode in which
they don't report validity errors.  See the definitions of "validity
constraint" and "at user option".

>Non-validating parsers of course won't read the external subset.

Non-validating parsers *need not* read the external subset, but they
can if they want to.  Validating parsers of course must do so.

-- Richard

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