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File: Data.xml
<?xml version="1.0"?>
<addressbook>
<address>
<name>
<title>Ms.</title>
<first-name>Doris</first-name>
<last-name>Smith</last-name>
</name>
<street>707 New Way</street>
<city>New York</city>
<state>ME</state>
<zip>00218</zip>
</address>
<address>
<name>
<first-name>Jane</first-name>
<last-name>Lee</last-name>
</name>
<street>283 First Avenue</street>
<city>Big City</city>
<state>MA</state>
<zip>02718</zip>
</address>
</addressbook>
File: Transform.xslt
<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" indent="no"/>
<xsl:key name="zipcodes" match="address" use="zip"/>
<xsl:template match="/">
<table border="1">
<xsl:for-each select="//address[generate-id(.)=generate-id(key('zipcodes', zip)[1])]">
<xsl:sort select="zip"/>
<xsl:for-each select="key('zipcodes', zip)">
<xsl:sort select="name/last-name"/>
<xsl:sort select="name/first-name"/>
<tr>
<xsl:if test="position() = 1">
<td valign="center" bgcolor="#999999">
<xsl:attribute name="rowspan">
<xsl:value-of select="count(key('zipcodes', zip))"/>
</xsl:attribute>
<b>
<xsl:text>Zip code </xsl:text><xsl:value-of select="zip"/>
</b>
</td>
</xsl:if>
<td align="right">
<xsl:value-of select="name/first-name"/>
<xsl:text> </xsl:text>
<b><xsl:value-of select="name/last-name"/></b>
</td>
<td>
<xsl:value-of select="street"/>
<xsl:text>, </xsl:text>
<xsl:value-of select="city"/>
<xsl:text>, </xsl:text>
<xsl:value-of select="state"/>
<xsl:text> </xsl:text>
<xsl:value-of select="zip"/>
</td>
</tr>
</xsl:for-each>
</xsl:for-each>
</table>
</xsl:template>
</xsl:stylesheet>
Output:
<table border="1"><tr><td valign="center" bgcolor="#999999" rowspan="1"><b>Zip code 00218</b></td><td align="right">Doris <b>Smith</b></td><td>707 New Way, New York, ME 00218</td></tr><tr><td valign="center" bgcolor="#999999" rowspan="1"><b>Zip code 02718</b></td><td align="right">Jane <b>Lee</b></td><td>283 First Avenue, Big City, MA 02718</td></tr></table>
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