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Math and xsl

From: Roshawn Dawson <udrago@---------.--->
To: NULL
Date: 6/2/2005 3:25:00 PM

Hi,

In my books.xml file, each book has a price node that contains other 
nodes.  It looks like this:

<books>
  <book>
   <title>Some Title</title>
   <author>One Author</author>
   <author>Another Author</author>
   <listprice>
    <amount>1726</amount>
    <formattedprice>$17.26</formattedprice>
   </listprice>
   <ourprice>
    <amount>1531</amount>
    <formattedprice>$15.31</formattedprice>
   </ourprice>
  </book>
  <!-- other book nodes go here -->
</books>

What I'd like to do is subtract the formattedprice node of ourprice from 
the formattedprice node of listprice to get the difference.  This is 
what I'm aiming for:

<xsl:value-of select="books/book/listprice/formattedprice - 
books/book/ourprice/formattedprice"/>

However, the result I get is NaN.  After checking thing out, the problem 
is that the data for each formattedprice begins with the "$" character. 
  Is there a way that I can remove that character so that I get the 
desired data?

Thanks,
Roshawn

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