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<p>The external subset, if any,
must match production for <span class="LITERAL">extSubset</span>.</p>

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<p>The <span class="LITERAL">extSubset</span> production constrains what type of
declaration may be contained in the external subset. This constraint
generally means that the external subset of the DTD must only include
whole declarations or parameter entity references. See the
<span class="LITERAL">extSubset</span> production in the EBNF grammar at the
end of this chapter for specific limitations.</p>

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