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[xsl] Is it possible to select only nodes with distinct element?

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Hi

I need to select only distinct nodes, something like SELECT DISTINCT in SQL.
By distinct I mean that one element of node is distinct.

example:
xml

<a>
	<b>1</b>
</a>
<a>
	<b>1</b>
</a>
<a>
	<b>2</b>
</a>

xsl should select and transform only

<a>
	<b>1</b>
</a>
<a>
	<b>2</b>
</a>

and in output I should have only one copy of

<a>
	<b>1</b>
</a>

Is that possible or I should change xml?

Thanks in advance

Denis Kranjcec


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