Set of distinct values

Hello,

I was wondering anyone can suggest a way that XSL can select a set of
distinct values from an XML document, similar to a "Select DISTINCT"
command in SQL.

For example, I'd like to transform this:

<root>
	<node>a</node>
	<node>b</node>
	<node>c</node>
	<node>a</node>
	<node>b</node>
	<node>c</node>
	<node>a</node>
	<node>b</node>
	<node>c</node>
	<node>a</node>
	<node>b</node>
	<node>c</node>
	<node>d</node>
</root>

Into this =>

<distinct>
	<node>a</node>
	<node>b</node>
	<node>c</node>
	<node>d</node>
</distinct>

Thanks, 
    Jason

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