Using a variable to check to see if that element exists in a

I am trying to use the variable myKey to check to see if it's value (ie.
"currencyCode") is an element in another document.
I am having some problems.  does anyone know what is wrong with this xsl.
I get the following error:


XSL Error: pattern = 'document('en_US.xml')/locale/$myKey'
Extra illegal tokens: 'myKey', style tree node:
org.apache.xalan.xslt.ElemIf@206
d161
XSL Error: Could not parse new_currency.xsl document!, Location
file:/C:/javaone
/new_currency.xsl, line 11, offset 55
XSL Error: SAX Exception, Location file:/C:/javaone/new_currency.xsl, line
11, o
ffset 55
pattern = 'document('en_US.xml')/locale/$myKey'
Extra illegal tokens: 'myKey'
        at
org.apache.xalan.xslt.XSLTEngineImpl.error(XSLTEngineImpl.java:1443)
        at
org.apache.xalan.xslt.XSLTEngineImpl.processStylesheet(XSLTEngineImpl
.java:673)
        at
org.apache.xalan.xslt.XSLTEngineImpl.process(XSLTEngineImpl.java:507)

        at transform.main(transform.java:54)





Here is my xsl template::
<xsl:template match="object">
     <xsl:for-each select="property">
          <xsl:variable name="myKey" select="key"/>
          <xsl:if test="$myKey='currencyCode'">
               This works; try the next if
               <xsl:if test="document('en_US.xml')/locale/$myKey">
                    insert label
               </xsl:if>
          </xsl:if>

           </xsl:for-each>
  </xsl:template>



Here is my en_US.xml:
<locale>
     <currencyCode>Currency Code</currencyCode>
     <fraction>Fraction</fraction>
</locale>


Here is my main xml doc:
<object>
   <property>
     <key>currencyCode</key>
     <value>USD</value>
    </property>
   <property>
     <key>fraction</key>
     <value>cent</value>
    </property>
</object>





Laura L. Menke
IBMUSM07(menkell)
Phone 507-253-8901 Tie 5535907
 menkell@xxxxxxxxxx


When facing a difficult task, act as though it is impossible to fail. If
you're going after Moby Dick, take along the
          tartar sauce.



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