Re: comparison of attribute values

Hi,
What I would like to do is to insert a row into a table if there is a
difference in an attribute value anywhere in the document; for example, this
data should produce 2 columns (USD and EUR):

<fees>
    <basic-fees>
        <fee1 currency="USD"><amount>20</amount></fee1>
        <fee2 currency="EUR"><amount>25</amount></fee2>
    </basic-fees>
    <special-fees>
        <fee3 currency="EUR"><amount>20</amount></fee3>
    </special-fees>
    <total currency="USD">65</total>
</fees>

<!-- desired output for above doc -->
<table>
    <tr><td>FEE</td><td>USD</td><td>EUR</td></tr>
    <tr><td>fee1</td><td> 20   </td><td>        </td></tr>
    <tr><td>fee2 </td><td>        </td><td> 25  </td></tr>
    <tr><td>fee3</td><td>        </td><td>  20  </td> </tr>
    <tr><td>total</td><td> 65   </td><td>       </td></tr>
</table>

  <xsl:key name="fee-currency" match="*[@currency and substring(local-name(),1,3)='fee']"
    use="@currency"/>

  <xsl:template match="fees">
    <table>
     <tr>
      <xsl:for-each select="key('fee-currency')/@currency">
         <td><xsl:value-of select="."/></td>
      </xsl:for-each>
     </tr>
     <xsl:for-each select="*/*[substring(local-name(),1,3)='fee']">
       <tr>
         <xsl:variable name="fee" select="."/>
         <xsl:for-each select="key('fee-currency')/@currency">
           <td>
             <xsl:if test="$fee/@currency=.">
               <xsl:value-of select="$fee/amount"/>
             </xsl:if>
           </td>
         </xsl:for-each>
       </tr>
     </xsl:for-each>
    </xsl:template>