> I have. The performance benefits of using keys are substantial.
>
> I have two versions of a program to join the <row> elements in <ARPT> with
the row elements in <ANAV> with the <row> elements in <BDRY>:
>
> 1. The first version uses an xsl:for-each within an xsl:for-each within an
xsl:for-each.
>
> 2. The second version uses keys.
>

My comment was about comparing an implementation using XSLT keys to a version
using maps, not comparing it to a version using sequential searching.

Michael Kay
Saxonica