This feature is useful when you want to find the name or location of a message element without opening the message file with the message definition editor.
To view the elements of a message file in the EST Project Explorer:
In the EST Project Explorer, expand the Messages folder in the interface subproject or in a nonterminal subproject of your service flow project.
In the Messages folder, expand a message file (such as i_Flow_008.sfmxsd). The messages in the message file are displayed underneath the name of the message file.
You can continue to expand message elements (including groups) as long as they contain other message elements.