XSL if help needed please - xslt

Question

i am converting an html form to xml sequence, i am using a recursive function to achieve this
so the input to param "list" will be of the form
name=value&name=value&name=value
The template below does this fine and returns an xml sequence as follows
<name>value</name><name>value</name><name>value</name>
Ok so the problem
some of the name value pairs are special and i would like to add a attribute to them so the output would be
<name>value</name><name attr="special">value</name><name>value</name>
so to do this i have an external xml file with a list of special names as follows
<settings><google><option from="color"/><option from="size"/></google></settings>
So if we assume i have a xsl variable $SETTINGS connected to this external document above
<xsl:for-each select="$SETTINGS/google/option"></xsl:for-each>
Should be node with 2 children 1 called color and the other size
wot i want to do is if 1 of these children names = $name add the attribute
something like <xsl:if test="$name = $SETTINGS/google/option/ckild name">
<xsl:template name="tokenize">
<xsl:param name="list"/>
<xsl:variable name="seperator" select="'&'"/>
<xsl:variable name="first" select="substring-before(concat($list, $seperator), $seperator)"/>
<xsl:variable name="butfirst" select="substring-after($list, $seperator)"/>
<xsl:variable name="name" select="normalize-space(substring-before($first, '='))"/>
<xsl:variable name="value" select="normalize-space(substring-after($first, '='))"/>
<xsl:if test="string-length($name)>0 and string-length($value)>0">
<xsl:element name="{$name}">
<xsl:for-each select="$SETTINGS/google/option">
-----> <xsl:if test="$name = $SETTINGS/google/option/ckild name">
<xsl:attribute name="option"/>
</xsl:if>
</xsl:for-each>
<xsl:value-of select="$value"/>
</xsl:element>
</xsl:if>
<xsl:if test="$butfirst">
<xsl:call-template name="tokenize">
<xsl:with-param name="list" select="$butfirst"/>
<xsl:with-param name="seperator" select="$seperator"/>
</xsl:call-template>
</xsl:if>
</xsl:template>
Many Thanks
Tim Dodgson

Answer 1

This stylesheet:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="SETTINGS" select="/settings"/>
<xsl:template match="/">
<xsl:call-template name="tokenize">
<xsl:with-param name="pString"
select="'color=blue&name=value&size=big'"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="tokenize">
<xsl:param name="pString"/>
<xsl:param name="pSeperator" select="'&'"/>
<xsl:choose>
<xsl:when test="not($pString)"/>
<xsl:when test="contains($pString,$pSeperator)">
<xsl:call-template name="tokenize">
<xsl:with-param name="pString"
select="substring-before($pString, $pSeperator)"/>
<xsl:with-param name="pSeperator" select="$pSeperator"/>
</xsl:call-template>
<xsl:call-template name="tokenize">
<xsl:with-param name="pString"
select="substring-after($pString, $pSeperator)"/>
<xsl:with-param name="pSeperator" select="$pSeperator"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="vName"
select="normalize-space(substring-before($pString,'='))"/>
<xsl:variable name="vValue"
select="normalize-space(substring-after($pString,'='))"/>
<xsl:if test="$vName and $vValue">
<xsl:element name="{$vName}">
<xsl:if test="$vName = $SETTINGS/google/option/#from">
<xsl:attribute name="attr">special</xsl:attribute>
</xsl:if>
<xsl:value-of select="$vValue"/>
</xsl:element>
</xsl:if>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
With this input:
<settings>
<google>
<option from="color"/>
<option from="size"/>
</google>
</settings>
Output:
<color attr="special">blue</color>
<name>value</name>
<size attr="special">big</size>
Note: Node set comparison