Returning a string from a function

[Barry Lay <blay@xxxxxxxxxxxxxxxxxxx>]

I have the following in a stylesheet:

<xsl:function name="local:logicalName">
 <xsl:param name="name"/>

 <xsl:analyze-string select="$name" regex="_">
   <xsl:non-matching-substring>
   <xsl:variable name="substring" select="."/>
     <xsl:choose>
       <xsl:when test="$locals/lookup/words/word[@physical=$substring]">
         <xsl:choose>
           <xsl:when 
test="$locals/lookup/words/word[@physical=$substring and @logical='*']">
             <xsl:value-of select="$substring"/>
           </xsl:when>
           <xsl:otherwise>
             <xsl:value-of 
select="$locals/lookup/words/word[@physical=$substring]/@logical"/>
           </xsl:otherwise>
         </xsl:choose>
       </xsl:when>
       <xsl:when 
test="$locals/lookup/words/word[@shortPhysical=$substring]">
         <xsl:choose>
           <xsl:when 
test="$locals/lookup/words/word[@shortPhysical=$substring and 
@logical='*']">
             <xsl:value-of select="$substring"/>
           </xsl:when>
           <xsl:otherwise>
             <xsl:value-of 
select="$locals/lookup/words/word[@shortPhysical=$substring]/@logical"/>
           </xsl:otherwise>
         </xsl:choose>
       </xsl:when>
       <xsl:otherwise>
         <xsl:value-of select="concat(substring(., 1, 1), 
lower-case(substring(., 2)))"/>
       </xsl:otherwise>
     </xsl:choose>
   </xsl:non-matching-substring>
 </xsl:analyze-string>
</xsl:function>

The $locals document contains reserved words that have special 
conversion rules, like this:

<?xml version="1.0"?>
<lookup>
   <words>
       <word physical="ACCT" shortPhysical="*" comment="*" 
logical="Account"/>
...
       <word physical="ZIP" shortPhysical="*" comment="*" logical="*"/>
   </words>
</lookup>

What I would like it to do is convert

ACCOUNT_TO_GROUP

into

AccountToGroup

via <xsl:value-of select="local:logicalName(@name)"/> but instead it is 
putting spaces between the words.  I understand that xsl:function is 
defined to return a sequence which is what I guess is going on here.  I 
can use string-join to squish them back together, but is there a way to 
output the desired result from the function directly?

Thanks,
Barry