Name
In DTD
Text from specification
Parameter entity references may only appear in the DTD.
Explanation
This constraint is self-evident because the %
character has no significance
outside of the DTD. Therefore, it is perfectly legal to have an
element like this in your document:
<ok>%noproblem;</ok>
The text %noproblem;
is
passed on by the parser without generating an error.
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