>   The 3rd row's integer part is different than
>   2nd(which makes *WA*4138 after *wA*4136
> 
> I can't see any reason why the later characters should have any
> influence on the sorting if the first characters are different.

Change your data-type to 'number' :

<xsl:sort select="@Location" data-type="number" order="ascending"
case-order="upper-first"/>

and you will get the ordering you're after.

Case-order seems to function across the whole sort with
data-type='number' but not with data-type='text'.

Don't know why, I can't even seem to guess :)

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list