With PROC SOAP, you can include an optional SOAPEnvelope element in your XML
file. Do this if you want to include custom information in the SOAPHeader element. A
SOAP envelope wraps the message, which has an application-specific message
vocabulary. The SOAPHeader content is added to the actual SAS registered web service
request. This addition occurs because there could be additional SOAPHeader elements
including elements that support WS-Addressing or WS-Security that were not included
in the XML file that was passed to PROC SOAP. The XML code that is transmitted
might not exactly match the XML code provided in this case. ...
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