ENCODING and CODEDCHARSETID
should not be set in most situations since you want a message to be
described by its native numeric and character encoding, which are
the default attributes for these parms.
FORMAT should be set
if you intend for a WebSphere MQ QMgr conversion exit to be invoked
when an application GETs a message. The FORMAT name is the actual
name of the conversion exit that is invoked when an application GETs
a message with the CONVERT get message option specified. The FORMAT
name in the message descriptor is set when a message is PUT on a queue.
Refer to WebSphere MQ literature for details about creating a conversion
exit.
MSGID and CORRELID are
updated on PUTs and GETs, so remember to reset their values appropriately
when performing multiple PUTs or GETs with the same message descriptor.