XML filter/conditional/sorting question

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Hello,

I'm looking at the code at:

http://www.w3schools.com/xsl/xsl_choose.asp

Very helpful site, however, I want to do something more. Example: my xml data
<?xml version=&quot;1.0&quot; encoding=&quot;ISO-8859-1&quot;?>
<catalog>
<cd>
<title>Empire Burlesque</title>
<artist>Bob Dylan</artist>
<country>USA</country>
<company>Columbia</company>
<price>10.90</price>
<year>1985</year>
</cd>
<cd>
<title>Empire Burlesque</title>
<artist>Bob Dole</artist>
<country>USA</country>
<company>Columbia</company>
<price>10.90</price>
<year>1985</year>
</cd>
.
.
.
</catalog>

How do write in the xls file (use the one at

http://www.w3schools.com/xsl/xsl_choose.asp)

to display that if the people with lastname begins in D, the color of this cell is red?

Thank you for helping!
Regards,
John