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[xsl] How do I count the number of elements in a key ?

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Hi,

I have an XML document with the following structure:

<inventory>
 <row>
   <hostmame>AA</hostname>
   <serial>A</serial>
 </row>
 <row>
   <hostmame>BB</hostname>
   <serial>B</serial>
 </row>
 <row>
    ...
 </row>
</inventory>

I defined a key such as:
<xsl:key name="systems" match="/inventory/row/serial" use="."/>

How do I count the number of elements in the key "systems" seeing that several row could have the same "serial" value ? The purpose being to compute the number of unique serial values found in the XML document...

Thanks beforehand,
Michael

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