To delete a message definition file from your message model:
Switch to the Broker Application Development
perspective.
In the Resource Navigator, right-click the message definition file
(file extension *.mxsd) that you want to delete,
then click Delete on the pop-up menu. Alternatively, select the message definition file that you want to delete
in the Resource Navigator then from the menu bar, click Edit >
Delete, or press the Delete key.
In the Confirm Resource Delete window, click Yes to
delete the message definition file. Alternatively, click No or
press the Esc key to cancel the message definition file deletion.
Important: All files and objects associated with the
message definition file are deleted. This action cannot be undone.