[xsl] Sum question.

Subject: [xsl] Sum question.
From: champion boliao <gsem980@xxxxxxxxxxxx>
Date: Thu, 27 Mar 2003 16:26:06 +0800 (CST)
This is my data.xml:
<?xml version="1.0" encoding="ISO-8859-1" ?> 
<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 Sun MicroSystems</title> 
  <artist>Andrew Agassi</artist> 
  <country>USA</country> 
  <company>Apple</company> 
  <price>10.92</price> 
  <year>1999</year> 
</cd>
<cd>
  <title>Empire Microsoft Windows</title> 
  <artist>Bill Gate</artist> 
  <country>USA</country> 
  <company>Seattle</company> 
  <price>130.90</price> 
  <year>1987</year> 
</cd>
</catalog>

This is my data.xsl:
<?xml version="1.0" encoding="ISO-8859-1" ?> 
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:template match="/">
<html>
<body>
  <h2>My CD Collection</h2> 
<table border="1">
<tr bgcolor="#9acd32">
  <th align="left">Title</th> 
  <th align="left">Artist</th> 
</tr>
<xsl:for-each select="catalog/cd">
<tr>
<td>
  <xsl:value-of select="title" /> 
</td>
<td>
<xsl:value-of select="artist" /> 
  </td>
  </tr>
  </xsl:for-each>
  </table>
  </body>
  </html>
  </xsl:template>
</xsl:stylesheet>

This is my question:
How should I modify my data.xsl to output the sum of
CD price in my last line. That is to say, after loop
through all the CD information, in my last line, I
want to display the Sum of all price.

Please give me your insight.
Thank you.

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