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Basically if you are receiving xml file via http set the service input as node (object),your flow will be to parse the xml file and map to your target document or depends on your flow process.Here is the step
XMLNodeToDocument (Parses the xml document to a IDATA structure)
For testing process of the xml file you have to follow these steps for parsing and mapping.
xmlStringToXMLNode(set xmldata with your xml file)
XMLNodeToDocument
HTH,
RMG
#Integration-Server-and-ESB#Flow-and-Java-services#webMethods