The primary difference between an Information Resource Definition and an Information Resource Instance is that the latter can be sent to someone—or many someones. Figure 10-6 shows that each Information Resource Instance may be sent via one or more Distributions each of which must be to a Party.
Thus, if an electronic mail message may be sent from “David Hay” to “Bob Hay”, the definition of its contents constitutes an Information Resource Definition. One Electronic Copy is sent to “Bob Hay”, and one Electronic Copy is maintained by “David Hay”. These represent two Distributions of an Electronic Copy.
Clearly the world of cyberspace clouds the distinctions here. Traditionally one Physical Copy of a magazine might be distributed ...