[xsl] XSL count function

["RJ P" <peterson_rj@xxxxxxxxxxx>]

If I have the following xml, How can I get the number of red books that are 
17.99.

<library>
<book>
<price>17.99</price>
<color>red</color>
<pages>200</pages>
</book>
<book>
<price>17.99</price>
<color>blue</color>
<pages>200</pages>
</book>
<book>
<price>17.49</price>
<color>red</color>
<pages>200</pages>
</book>
<book>
<price>17.99</price>
<color>red</color>
<pages>100</pages>
</book>
<book>
<price>18.99</price>
<color>red</color>
<pages>200</pages>
</book>
</library>

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