External DTD Grammar

[Richard Tobin]

> Replacement texts can't contain PE references (PE declarations can,
> but the references are resolved at entity declaration time), so it isn't
> even necessary to push back the replacement text onto the input stream.

This is not true - references are expanded when the entity is declared,
but that may produce text containing new entity references.  Consider:

 <!ENTITY % p1 "&#37;p2;">
 <!ENTITY % p2 "not">
 <!ENTITY e1 "this is %p1; obvious">

Entity e1 must expand to "this is not obvious".

-- Richard

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