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<p>Parameter entity references may only appear in the
DTD.</p>

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<p>This constraint is self-evident because the
<span class="LITERAL">%</span> character has no significance outside of the
DTD. Therefore, it is perfectly legal to have an element like this in
your document:</p>

<span class="PROGRAMLISTING"><pre>&lt;ok&gt;%noproblem;&lt;/ok&gt;</pre></span>


<p>The text <span class="LITERAL">%noproblem;</span> is passed on by the parser
without generating an error. </p>
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