[xsl] Avoiding treating duplicate items when grouping

Hello all!

	I have one question and I think I'm stuck. Here you are a sample
input XML document.
Neither the <rec> elements nor the <user> elements within the <rec> elements
are ordered in
any particular order.

	<users>
		<rec date="2001-01-24">
			<user gid="G2" last-access="2001-01-24
17:50:37.72677">M-1</user>
			<user gid="G1" last-access="2001-01-24
18:05:12.816369">F-1</user>
			<user gid="G2" last-access="2001-01-24
18:10:12.302868">M-4</user>
			<user gid="G1" last-access="2001-01-24
18:10:12.846846">F-2</user>
			<user gid="G2" last-access="2001-01-24
18:10:13.367885">M-5</user>
			<user gid="G2" last-access="2001-01-24
18:05:14.113309">M-3</user>
		</rec>
		<rec date="2001-01-25">
			<user gid="G2" last-access="2001-01-25
11:42:36.842908">M-2</user>
			<user gid="G2" last-access="2001-01-25
11:43:05.695899">M-4</user>
		</rec>
		<rec date="2001-10-11">
			<user gid="G1" last-access="2001-10-11
11:03:39.7898">F-1</user>
			<user gid="G1" last-access="2001-10-11
09:50:47.711776">F-2</user>
		</rec>
		<rec date="2001-12-31">
			<user gid="G1" last-access="2001-12-31
11:38:49.700800">M-2</user>
			<user gid="G1" last-access="2001-12-31
19:14:09.822549">M-1</user>
		</rec>
		...
	</users>


	Given a year and month, what I want is to obtain a list (in HTML) of
those users
(ordered by user name: M-1, M-2, etc.) whose last access was in that month
of the year
grouped by "gid". Applying the Muenchian method for grouping, I have written
the following
style sheet. For example, fiven the year "2001" and month January (01), the
style sheet
works but the user M-4 is included twice because it appears in record of
2001-01-24 and in
record of 2001-01-25. So how can I avoid duplicates?, that is, each user
satisfying the
year and month given, should appear only once in the list. If a user appears
in several
records, I like to select that with the most recent last access. A user will
not appear
more than once within a record.

	Any help would be highly appreciated. Thanks in advance.


My XSL file:
============

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">

	
<!--================================================================-->
	<!-- Parameter of the form: yyyy-mm
-->
	
<!--================================================================-->
	<xsl:param name="theDate"/>

	
<!--================================================================-->
	<!-- Output format
-->
	
<!--================================================================-->

	<xsl:output method="html" indent="yes" omit-xml-declaration="yes"
		doctype-public="-//W3C//DTD HTML 4.0 Transitional//EN"
		encoding="ISO-8859-1"/>


	<xsl:strip-space elements="*"/>

	
<!--================================================================-->
	<!-- Grouping criteria (Muenchian method)
-->
	
<!--================================================================-->
	<xsl:key name="group-by-gid"
match="rec[substring(@date,1,7)=$theDate]/user" use="@gid"/>


	<xsl:template match="users">
		<html>
		<head>
		<title>User Stats</title>
		</head>
		<body>
		<!--
			 Check whether there are datat or not
		-->
		<xsl:choose>
			<xsl:when
test="count(./rec[substring(@date,1,7)=$theDate]) > 0">
				<div align="center">
				<table border="1" cellpadding="5"
cellspacing="0">
  				<tbody>
					<xsl:for-each
select="./rec/user[count(.|key('group-by-gid',@gid)[1])=1]">
						<xsl:sort select="@gid"
data-type="number" order="ascending"/>
						<!-- Writes a table header
with the value of the grouping criteria -->
						<tr>
							<th colspan="2"
align="center"><xsl:value-of select="@gid"/></th>
						</tr>
						<tr>
							<td
align="center">User</td>
							<td
align="center">Last Access</td>
						</tr>
						<xsl:for-each
select="key('group-by-gid',@gid)">
							<!-- Alphabetical
order by user name -->
							<xsl:sort select="."
data-type="text" order="ascending"/>
							<xsl:apply-templates
select="."/>
						</xsl:for-each>
					</xsl:for-each>
				</tbody>
				</table></div>
			</xsl:when>
			<xsl:otherwise>
				<div align="center">
				<table border="0" cellspacing="0"
cellpadding="0" style="margin-left:.5cm">
					<tbody>
						<tr>
							<td width="370"
align="center" valign="middle">NO USERS</td>
						</tr>
					</tbody>
				</table>
				</div>
			</xsl:otherwise>
		</xsl:choose>
		</body>
		</html>
	</xsl:template>


	<xsl:template match="user">
		<tr>
			<td align="left"><div style="font-family:monospace">
				<xsl:value-of select="."/>
			</td>

			<td align="center">
				<xsl:value-of select="@last-access"/>
			</td>
		</tr>
	</xsl:template>

</xsl:stylesheet>


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