using keys for counting not sorting

Hi,

I am trying to use keys (as I understand variables cannot change their value)
for counting rather than sorting:-

So with the following xml:

<LOG>      
      <DIRECT>
      <COMMUNICATION_TYPE> PAGETELL </COMMUNICATION_TYPE>
      <Invoc_serial> 27 </Invoc_serial>
      <Serial> 3087908 </Serial>
      <USAGE> TELL </USAGE>
      <MESSAGE_TYPE> EMOTE </MESSAGE_TYPE>
      <CHARACTER_ID> 10010 </CHARACTER_ID>
      <CHARACTER_STATUS> 3 </CHARACTER_STATUS>
      <LOCATION_ID> 45040 </LOCATION_ID>
      <TARGET_CHARACTER_ID> 444444 </TARGET_CHARACTER_ID>
      <TARGET_CHARACTER_STATUS> 6 </TARGET_CHARACTER_STATUS>
      <TARGET_CHARACTER_LOCATION_ID> 23222 </TARGET_CHARACTER_LOCATION_ID>
      <MESSAGE>hello</MESSAGE>
      <TIME> 'Mon, 26 Nov 2001 15:40:29 +0000' </TIME>
      </DIRECT>

etc etc 50,000 or so times
</LOG>

I need to count, then output as a number, the occurences of every CHARACTER_ID
(so I know they have sent a message) and also where that same ID occurs as
a TARGET_CHARACTER_ID (so I know they have received a message). So how
could I perhaps adapt Jennie's example 

<xsl:key name="contacts-by-surname" match="contact" use="surname" />
<xsl:template match="records">
	<xsl:for-each select="contact[count(. | key('contacts-by-surname',
surname)[1]) = 1]">
		<xsl:sort select="surname" />
		<xsl:value-of select="surname" />,<br />
		<xsl:for-each select="key('contacts-by-surname', surname)">
			<xsl:sort select="forename" />
			<xsl:value-of select="forename" /> (<xsl:value-of select="title" />)<br />
		</xsl:for-each>
	</xsl:for-each>
</xsl:template>

to do this instead of sorting them, so the output looks like:-

CHARACTER_ID 3434343 sent 435 messages, received 234
CHARACTER_ID 121212 sent 432 messages, received 128

and also do a total sent and received and an average?

Cheers

Ahmad

-------------------------------------------------
Ahmad J Reeves BSc (Hons) MSc (Dist) PhD Student
Information, Media & Communication Research Group
Department of Computer Science
Queen Mary, University of London
E1 4NS
Tel +44(0) 207 882 5257
Fax +44(0) 208 980 6533
http://www.dcs.qmw.ac.uk/imc

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