XSLT 1.0 Grouping on multiple values on multiple levels - xslt

Question

edited in response to comments *
Hello,
I am an XSLT noob and need some help. I am trying to do an filter/group combination with XSLT 1.0 (can't use XSLT 2.0 for this application).
Here is an example of the xml
<entry>
<item>
<name>Widget 2</name>
<rank>2</rank>
<types>
<type>Wood</type>
<type>Fixed</type>
<type>Old</type>
</types>
</item>
<item>
<name>Widget 1</name>
<rank>2</rank>
<types>
<type>Metal</type>
<type>Broken</type>
<type>Old</type>
</types>
</item>
<item>
<name>Widget 3</name>
<rank>1</rank>
<types>
<type>Metal</type>
<type>New</type>
</types>
</item>
</entry>
Now what I want to do is output html where I get a subset of the XML based on <type> and then group on rank. For example, if the user selects all items with the type Metal, the output should be:
<p class="nospace"><font color="#800000">
<b>Rank 1</b></font></p>
<li id="mylist"><b>Widget 3</b></li>
<br\>
<p class="nospace"><font color="#800000">
<b>Rank 2</b></font></p>
<li id="mylist"><b>Widget 1</b></li>
<br\>
of if the user user chooses the type Old the output would be
<p class="nospace"><font color="#800000">
<b>Rank 2</b></font></p>
<li id="mylist"><b>Widget 1</b></li>
<li id="mylist"><b>Widget 2</b></li>
<br\>
I can group using keys on rank along easily enough, but trying to do both is not working. Here is a sample of the xslt I have tried:
<xsl:param name="typeParam"/>
<xsl:key name="byRank" use="rank" match="item"/>
<xsl:for-each select="item[count(.|key('byRank',rank)[1])=1]">
<xsl:sort data-type="number" select="rank"/>
<xsl:for-each select="key('byRank',rank)">
<xsl:sort select="name"/>
<xsl:if test="count(rank)>0">
<p class="nospace"><font color="#800000"><b>Rank<xsl:value-of select="rank"/></b></font></p>
<xsl:for-each select="types[types=$typeParam]">
<li id="mylist"><b><xsl:value-of select="../name"/></b></li>
</xsl:for-each>
<br/>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
The result I get from this is I do indeed get the subset of my xml that I want but it also displays all of the various rank values. I want to limit it to just the ranks of the type that is specified in $typeParam.
I have tried moving the for-each statement to earlier in the code as well as modifying the if statement to select for $typeParam but neither works. I have also tried concat-ing my key with rank and type but that doesn't seem to work either (It only works if the type in $typeParam is the first child under types).
Thanks
jeff

Answer 1

This stylesheet:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:key name="kItemByRank" match="item" use="rank"/>
<xsl:param name="pType" select="'Old'"/>
<xsl:template match="entry">
<xsl:for-each select="item[count(.|key('kItemByRank',rank)[1])=1]">
<xsl:sort select="rank" data-type="number"/>
<xsl:variable name="vGroup" select="key('kItemByRank',rank)[
types/type = $pType
]"/>
<xsl:if test="$vGroup">
<p class="nospace">
<font color="#800000">
<b>
<xsl:value-of select="concat('Rank ',rank)"/>
</b>
</font>
</p>
<xsl:apply-templates select="$vGroup">
<xsl:sort select="name"/>
</xsl:apply-templates>
<br/>
</xsl:if>
</xsl:for-each>
</xsl:template>
<xsl:template match="item">
<li id="mylist">
<b>
<xsl:value-of select="name"/>
</b>
</li>
</xsl:template>
</xsl:stylesheet>
Output:
<p class="nospace">
<font color="#800000">
<b>Rank 1</b>
</font>
</p>
<li id="mylist">
<b>Widget 3</b>
</li>
<br />
<p class="nospace">
<font color="#800000">
<b>Rank 2</b>
</font>
</p>
<li id="mylist">
<b>Widget 1</b>
</li>
<br />
And whit pType param set to 'Old', output:
<p class="nospace">
<font color="#800000">
<b>Rank 2</b>
</font>
</p>
<li id="mylist">
<b>Widget 1</b>
</li>
<li id="mylist">
<b>Widget 2</b>
</li>
<br />