Most message-oriented middleware (MOM) products treat messages as lightweight entities that consist of a header and a payload. The header contains fields used for message routing and identification; the payload contains the application data being sent In general, the transport-level message context consists of the following:
TransportMessageContext
message id - unique id which identifies this message
RequestMetaData - meta data is not carried in the payload of
the message, but separately and is used
as the "context" for processing the message.
Examples of such information might be
transmitted in the mata data are the Content
Type header, security information, or locale
information. Base for the schema is defined in
TransportCommon.xsd, extensions defined
in each transport provider-specific schema
headers - request headers
request body - the payload of the request
ResponseMetaData - base for the schema is defined in
TransportCommon.xsd, extensions defined
in each transport provider-specific schema
headers - response headers
response code - success/failure status code
response message - typically a one-line response message
response body - the payload of the response