Store the result of a <xsl:sort> in a variable

Hi,
I am making use of a result tree as a input xml to the xsl.
And sorting some elements in it.
Now the problem is perhaps, that the sorted list is being added to the same
result tree.
And as a consequence I'm getting double the no.of elements...First set
sorted and the 
second one, as it was ealier in the result set.
I think if I can store the result of the sort in a variable, this problem
will be solved.
Cud U pls help me.

Reards
Rohit
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