
Chapter 2. SOAP primer 21
2.5 SOAP interaction styles
SOAP messages are fundamentally one-way transmissions. They are combined
to form interaction patterns such as request-response. The modeling of
interaction patterns is only evident in WSDL and in mapping to a SOAP
transport. There is nothing in the SOAP message, such as a means of
correlating replies with requests, that indicates the interaction style. A new
specification, WS-Addressing, introduces headers to assist managing more
sophisticated interaction styles.
WS-I limits its attention to only one-way and request-response interaction styles
because of ambiguities in the WSDL for other interaction ...