basic q about sequence diagrams

From: Karl Hungus (nnnnndddddd_at_hotmail.com)
Date: 03/16/04 

Date: Tue, 16 Mar 2004 02:43:52 GMT

If two objects are represented in a sequence diagram with one message
joining them, and the message is a method call, which object is supposed to
have the method as one of its members?

example if I have a car object and I want to call a method
car.getPassengers() to return a collection of passengers

do I model it this way:

[car] ------getPassengers----->[passengers]
or
[system] ------getPassengers----->[car]

..brackets are boxes there...forgive the simplification

Thanks in advance,
Karl

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