RE: XSLT sort

> Im trying to get better performance by using keys, I have heard thats 
> possible but I dont know how to do.
If you have an expression of the form

//x[(_at_)y=$v]

then you can often improve performance by declaring a key

xsl:key name="k" match="x" use="@y"

and changing the expression to

key('k', $v)

But you won't get improved performance, or correct results, by shoving in
calls to key() where they don't make sense.

Michael Kay