How to retrieve Value of global parameter by matching

Hello,

I recently started to work with XSLT and have this question about global
parameters.

I work with web-based application, which produces PDF documents, using
FO-XML.
The documents include some dynamic fields. 
The values of those fields are coming from database and passed as global
parameters from servlet into XML. 

Snip of XML file:
========================================
<para>
	This is the value of Name filed: <fld id="client.name" />
	This is the value of Address filed: <fld id="client.address" />
	This is the value of PostCode filed: <fld id="client.postcode" />
</para>
========================================

Here is the associated XSL file:

========================================
<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" encoding="iso-8859-1"/>

  <xsl:param name="client.name"/>
  <xsl:param name="client.address"/>
  <xsl:param name="client.postcode"/>
....
....
 <xsl:param name="producer.name"/>
 <xsl:param name="producer.addr1"/>
....

 <xsl:template match="/">
    <xsl:apply-templates/>
  </xsl:template>

<xsl:template match="fld">
      <xsl:choose>
        <xsl:when test="@id='client.name'">         <xsl:value-of
select="$client.name"/></xsl:when>
        <xsl:when test="@id='client.address'">     <xsl:value-of
select="$client.address"/></xsl:when>
        <xsl:when test="@id='client.postcode'">   <xsl:value-of
select="$client.postcode"/></xsl:when>
....
....
        <xsl:when test="@id='producer.name'">      <xsl:value-of
select="$producer.name"/></xsl:when>
        <xsl:when test="@id='producer.address'">   <xsl:value-of
select="$producer.address'"/></xsl:when>
....
        <xsl:otherwise>
           <xsl:text>The field named [" </xsl:text>  
           <xsl:value-of select="@id"/>  
           <xsl:text>"] is not found!</xsl:text>
        </xsl:otherwise>
      </xsl:choose>
  </xsl:template>

</xsl:stylesheet>
==========================================

The result of transformation looks something like that:

========================================
	This is the value of Name filed: Jhon Smith
	This is the value of Address filed: XX Somestreet, Sometown
	This is the value of PostCode filed: NNN NNN

========================================
Where Jhon Smith, XX Somestreet, Sometown, NNN NNN - are values of
corresponding fields in database.



At the moment I have to add new [ <xsl:when test="@id='...'"> ...</xsl:when>
] entry for <fld> tag in XSL 
each time there is a filed with new ID to be added in the documents. 
There are already more than one hundred fields in the documents and the
number is growing.

My question is: 
Is there a better way to design <fld> tag?
In other words, is it possible to write some generic code, which will return
value of global parameter by matching fld[@id]
without need to update <fld> tag in XSL every time?


Thank you for your help,
Serhiy



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