2.1 Transport
The Workflow Instance Management Protocol can be used over any transport protocol that supports transmitting messages that are specified by the following protocols:
SOAP 1.1 [SOAP1.1]
SOAP 1.2 [SOAP1.2-1/2007]
This specification uses the term SOAP to mean either SOAP 1.1 or SOAP 1.2. An implementation of the Workflow Instance Management Protocol MUST support the processing of messages that are specified by either of these SOAP versions.