XPath
Pushes the value indicated by an XPath statement.
<wcf:Operation Name="XPath">
<wcf:Argument>//po:POID</wcf:Argument>
</wcf:Operation>
Valid XPath statement.
String value of the result found by executing the XPath statement.
You must use a valid XPath statement.
In the case of multiple matches, only the first match is used.
The following example expression constructs a correlation value by concatenating a constant "C_" with the purchase order ID from the current message. The purchase order ID is retrieved by using the XPath operation.
<ic:CorrelationID>
<ic:Expression>
<ic:Operation Name="Constant">
<ic:Argument>C_</ic:Argument>
</ic:Operation>
<wcf:Operation Name="XPath">
<wcf:Argument>//po:POID</wcf:Argument>
</wcf:Operation>
<ic:Operation Name="Concatenate" />
</ic:Expression>
</ic:CorrelationID>