As the reader has already probably figured out, the structure of Communication makes it clear that it is, in fact, a kind of Activity. This is now revealed officially in Figure 14-6. That is, Communication is a sub-type of Activity, just as Communication Procedure is a sub-type of Activity Specification.

It therefore follows that Communications Role is but a sub-type of Activity Role, and Authorship is a sub-type of Information Resource Role.

And of course, brochure design, commercial video, and commercial photograph, can now take their place as sub-types of information resource definition.

Figure 14-6: Communications ...

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