Message Transmission Optimization Mechanism


MTOM is the W3C Message Transmission Optimization Mechanism, a method of efficiently sending binary data to and from Web services.
MTOM is usually used with the XOP.

Application

MTOM only optimizes element content that is in the canonical lexical representation of the xs:base64Binary data type. Since there is no standard way to indicate whether data is in the canonical lexical representation, the mechanism for applying MTOM is implementation-dependent.
The use of MTOM is a hop-by-hop contract between one SOAP node and the next. There is no guarantee that the optimization will be preserved if there are multiple SOAP nodes involved.

Details

Although most users treat MTOM as a single mechanism, the MTOM specification defines it as three related features:
Sometimes the term "MTOM" is used as a shorthand to mean "MTOM with XOP". XOP is used as the referencing mechanism in the serialised XML infoset. In theory, the abstract MTOM model could be used with a different referencing mechanism or different container format; also, MTOM could be used over a different transport protocol instead of HTTP. In practice, MTOM is usually used with XOP, MIME and HTTP.