Traversing nodes and storing a matched value

My efforts to streamline my stylesheet into something
well-formed are paying off with help from this list. I
am currently working with XML input that looks like
this:

<menudata>
        <menu name="link1">
        <exsites>0</exsites>    
        </menu>
        <menu name="link2">
        <exsites>0</exsites>
                <menu name="link2a">
                <exsites>1</exsites>
                <exsites>2</exsites>
                </menu>
        </menu>
</menudata>

The value of the <exsites> element determines if its
parent <menu> element will appear in the output, based
on a $siteID parameter set in the stylesheet. In some
cases, <menu> has multiple <exsites> children.

I'm not clear how to use XSL to say, "if the value of
ANY <exsite> matches $siteID, then flag its parent's
node for different processing". Here's my attempt (the
section where I'm in trouble is commented):

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*"/>

<!-- siteID determines if a link is displayed for a
specific cobrand -->
<xsl:param name="siteID" select="2"/>

<xsl:template match="/menudata">
        <xsl:call-template name="write-menu">
                <xsl:with-param name="items" select="menu"/>
        </xsl:call-template>
</xsl:template>

<xsl:template name="write-menu">
        <xsl:param name="items" select="/.."/>

        <ul>
                <xsl:for-each select="$items">
                        <xsl:call-template name="parseExclusions"/>
                </xsl:for-each>
        </ul>

</xsl:template>

<xsl:template name="parseExclusions">

<!-- Check <exsites> for a match against $siteID - if
a match, don't display -->
        <xsl:for-each select="exsites">
                <xsl:if test="current()=$siteID">

<!-- This is where I need the stylesheet not to write
the link if any of the <exsites> values match the
$siteID parameter -->
<!-- For now I'm just writing out the value if it
matches $siteID -->
                <xsl:value-of select="current()"/>
                </xsl:if>
        </xsl:for-each>

                <li>
                        <xsl:value-of select="@name"/>
                        <xsl:if test="menu">
                                <xsl:call-template name="write-menu">
                                        <xsl:with-param name="items" 
select="menu"/>
                                </xsl:call-template>
                        </xsl:if>
                </li>

</xsl:template>

</xsl:stylesheet>


My instinct is to set a boolean variable if any
<exsite> element matches, then use that variable to
control the output. Something like this (in
pseudo-code):

<xsl:for-each select="exsites">
        <xsl:if test="current()=$siteID">
        <!-- set variable - var excludeFlag = 1 -->
        </xsl:if>
</xsl:for-each>

<!-- write tag - if (excludeFlag!=1)? -->
<li>
<xsl:value-of select="@name"/>
?
</li>
<!-- /if -->

But of course an XSL variable is a different beast.
That seems to be my real weakness in XSL, grasping the
concept of templates over variables.

Am I on the right track?

Thanks,

-Mat




                
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