not according to the XML specification
Yes I should have said if there is no dtd. In theory if there is a DTd
that references a an external file that the parser does not read that
could have defined the entities (but doesn't) it is still well
formed. However you will be hard pressed to find a parser that accepts
<!DOCTYPE x SYSTEM "x-secretprotocol:rubbish">
<x>
&wellformedexample;
</x>
David
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