When we defined the responsibilities of Catalog Entry, we didn't specify any participants. We can now make changes to the generated messages to specify the appropriate types for the messages and attributes.
This time, let's use the Path Browser, which will allow us to see everything we need in one browser. The Path Browser shows the successive navigation of not just one relationship, but of up to four relationships, starting from the selected source element. With the Path Browser, therefore, we can browse a protocol, its message specifications, the parameters of a selected message, and the type of a selected parameter all in the same browser. (See The Path Browser for more information about the Path Browser.)