SOAP Message Transmission Optimization Mechanism (MTOM)

SOAP Message Transmission Optimization Mechanism (MTOM) is one of a related pair of specifications that defines conceptually how to optimize the transmission and format of a SOAP message.

MTOM defines:
  1. How to optimize the transmission of base64binary data in SOAP messages in abstract terms
  2. How to implement optimized MIME multipart serialization of SOAP messages in a binding independent way using XOP
The implementation of MTOM relies on the related XML-binary Optimized Packaging (XOP) specification. As these two specifications are so closely linked, they are normally referred to as MTOM/XOP.

The specification is published by the World Wide Web Consortium (W3C) as a W3C Recommendation at SOAP Message Transmission Optimization Mechanism.