[xsl] calling a web service from XSLT

[Francis Norton <francis@xxxxxxxxxxx>]

(Apologies to xml-dev readers who may have seen my related message)

It's not a theoretical breakthrough or anything like that, but I thought 
xsl-list readers might be interested in a working example of calling a 
Web Service from XSLT.

For files like this:

<cardlist>
   <card number="00000000000000"/>
</cardlist>

you can run (with msxsl.exe - the "https:" URL appears to break saxon) 
the following  transform:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.0" xmlns:cdyne="http://ws.cdyne.com/";>
   <xsl:output indent="yes"/>
   <xsl:variable name="CheckCC" 
select="'https://secure.cdyne.com/creditcardverify/luhnchecker.asmx/CheckCC?CardNumber='" 
/>
   <!-- -->
   <!-- do a "pass-through" type transform  -->
   <xsl:template match="@* | node()">
       <xsl:copy>
           <xsl:apply-templates select="@* | node()"/>
       </xsl:copy>
   </xsl:template>
   <!-- -->
   <!-- for everything except elements in the target namespace -->
   <xsl:template match="card">
       <xsl:copy>
           <xsl:attribute name="CardValid">
               <xsl:value-of select="document(concat($CheckCC, 
@number))/cdyne:ReturnIndicator/cdyne:CardValid = 'true'" />
           </xsl:attribute>
           <xsl:apply-templates select="@* | node()"/>
       </xsl:copy>
   </xsl:template>
   <!-- -->
</xsl:stylesheet>

to get each card element marked up with a CardValid attribute containing 
a boolean true or false.

Not something I'd use in production lightly, and limited to Web Services 
with an HTTP GET binding, but satisfactory in its way.

Francis.


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