Is it possible to restrict an IDREF attribute so that it only matches child ID values?

[EDN Admin]

Suppose I have the following XML snippet:
<pre class="prettyprint <x child="value
<y id=z/>
</x>[/code]
I want to ensure that "x/@child" is limited, in this case, to "z". ("value" is a placeholder.") How do I do that?<br/>
<hr class="sig Will Pittenger

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