Salathe, once again, thanks a million for introducing me to xslt. I played around with the code and got it working. I'm really starting to like XSL now.

If anyone wants to know how I got it to sort, here's what I did (hopefully it helps someone else):

<xsl:sort select="r25:start_date" order="ascending" />

Also, I had to edit the $xml->load line to $xml->load('http://username:password@blah.com/blah.xml');

I tried to use $xml->load($feed); but it returned an error and I also tried $xml->loadxml($feed); but still got an error. I need to figure how I can check the url for errors prior to loading it.

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