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BP Server Developer's Guide
Messaging workstep : Message descriptor : Namespace
 

Namespace

If the XPath query for a payload property uses a namespace alias, then the same alias should also be defined in ‘Namespaces’ tag as shown in the following example.
<Namespaces>
    <Namespace alias=" po" uri="http://www.progress.com/PurchaseOrder"/>
    <Namespace alias="prd" uri="http://www.progress.com/Product"/>
</Namespaces>
The Message Manager automatically extracts all the namespaces used in the XML and save them in the message descriptor.