A collaboration diagram is another type of interaction diagram, in this case showing the
interactions between objects as a series of sequenced messages. This type of diagram is a
cross between an object diagram and a sequence diagram. Unlike the sequence diagram,which models the interaction in a column and row type format, the collaboration diagram
uses the free-form arrangement of objects, which makes it easier to see all interactions
involving a particular object. Messages are labeled with a chronological number to maintain
ordering information. Figure 25.19 provides an example of a collaboration diagram
for the Search properties use case.