The following topics describe how to access parts of the message
tree other than the message body data. These parts of the logical tree are
independent of the domain in which the message exists, and all these topics
apply to messages in all supported domains, including the BLOB domain. You
can access all parts of the message tree using a JavaCompute node, including
the Properties tree described in
Message tree structure,
and the
ExceptionList tree. Elements of
the message tree can be accessed in the same way as the message body data,
using a JavaCompute node.