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Recursive function problem

Subject: Recursive function problem
From: Nic Gibson <nicg@xxxxxxxxxx>
Date: Wed, 30 Jun 2010 08:28:31 +0000
 Recursive function problem
Good morning 

I'm writing a function to be used as part of a content conversion from one
DTD to another. The input is in the following form:

    <nameGrp role="editor" foreNames="Donald B." 
        mainName="Redford">Donald B. Redford</nameGrp>
        foreNames="Thutmose" foreTitle="III">Thutmose III</nameGrp>

and I need to get the output into the form:

    <name><fname>Donald B.</fname> <sname>Redford</sname></name>
    <name><fname>Thutmose</fname> <ntitle>III</ntitle></name>

I've clearly made an error in the function as the output I am getting is
on the lines of:

    <name>Donald B. Redford</name>
    <name>Thutmose III</name>

The relevant portions of the stylesheet are:

    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xd="http://www.oxygenxml.com/ns/doc/xsl"
    version="2.0" exclude-result-prefixes="dtg xd xs">
    <xsl:variable name='name-attrs' select="('foreNames', 'mainName', 'foreTitle')"/>
    <xsl:variable name='name-elems' select="('fname', 'sname', 'ntitle')"/>
    <xsl:template match="/">
            <xsl:apply-templates select='names/nameGrp'/>
    <xsl:template match='nameGrp'>
            <xsl:copy-of select='@role'/>
            <xsl:value-of select='dtg:attributes-to-elements(., $name-attrs, $name-elems)'/>
    <xsl:function name='dtg:attributes-to-elements'>

        <xsl:param name="element"/>
        <xsl:param name='attributes'/>
        <xsl:param name='elements'/>
        <!-- only the listed attributes, not all of them -->
        <xsl:variable name="attribs" select='$element/@*[local-name(.) = $attributes]'></xsl:variable>
        <!-- we want the attributes reverse sorted by the length of their values. -->
        <xsl:variable name='sorted-attribs' as='item()*'>
            <xsl:perform-sort select='$attribs' > 
                <xsl:sort select='string-length(string(.))' order="descending"/>

        <xsl:if test='count($attributes) != count($elements)'>
            <xsl:message terminate="yes">attributes-to-elements - attribute and element sequences must be the same size.</xsl:message>
        <xsl:value-of select='dtg:attr-to-elem-impl(string($element), $sorted-attribs, $attributes, $elements)'/>
    <xsl:function name="dtg:attr-to-elem-impl">
        <xsl:param name='source'/>
        <xsl:param name='input-attribs'/>
        <xsl:param name='attrib-names'/>
        <xsl:param name='element-names'/>
        <xsl:variable name='current-val' select='string($input-attribs[1])'/>
        <xsl:variable name='current-name' select='local-name($input-attribs[1])'/>
        <xsl:variable name='index' select='index-of($attrib-names, $current-name)'/>
        <xsl:variable name='output-element' select='$element-names[$index]'/>
        <xsl:variable name="next-attribs" select='$input-attribs[position() gt 1]'/>
            <xsl:when test="$source = ''">
                <xsl:value-of select="$source"/>
            <xsl:when test="count($input-attribs) = 0">
                <xsl:value-of select="$source"/>
            <xsl:when test="contains($source, $current-val)">
                <xsl:variable name='new-element'>
                    <xsl:element name="{$output-element}"><xsl:value-of select="$current-val"/></xsl:element>
                <xsl:variable name='before' select="substring-before($source, $current-val)"/>
                <xsl:variable name='after' select="substring-after($source, $current-val)"/>
                <xsl:variable name='result-before' 
                    select="dtg:attr-to-elem-impl($before, $next-attribs, $attrib-names, $element-names)"/>
                <xsl:variable name='result-after' 
                    select="dtg:attr-to-elem-impl($after, $next-attribs, $attrib-names, $element-names)"/>
                <xsl:sequence select="($result-before, $new-element, $result-after)"/>
                <xsl:sequence select="dtg:attr-to-elem-impl($source, $next-attribs, $attrib-names, $element-names)"/>


The large number of variables is due to my having traced through this in the oXygen debugger.
I've seen (in the degugger) that $new-element does contain the element created but it 
appears to be lost before the result is generated.

I'm pretty sure the error is in either the variable (new-element) that should be
creating the element or in the xsl:sequence instructions. However, I'm having a failing
to see the wood for the trees moment. Any pointers would be gratefully received.

By the way the recursion for result-before and result-after shoudl be safe as I know 
that the content of each attribute can only occur once in the text.



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