draw items from the library in electronic form. For example, imagine a situation
where the study packs shown in Figure 8.13 could be maintained electronically and
downloaded to the student's computer.
In a sequence diagram, objects and actors are aligned along the top of the diagram.
Labelled arrows indicate operations; the sequence of operations is from top to bot
tom. Ln this scenario, the library user accesses the catalogue to see whether the item
required is available electronically; if it is, the user requests the electronic issue of
that item. For copyright reasons, this must be licensed so there is a transaction between
the item and the user where the license is agreed. The item to be issued is then sent
to a network server object for compression before being sent to the library user.
You can find another example of a sequence diagram that expands a LIBSYS
use-case in Figure 7.8, which shows the sequence of actions involved in printing
an article.
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