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symbol in collaboration diagram comparison table

Subject	exist between	draw as	order by	correspond to	has definition
communication link	two objects whenever it is possible for one object to send a message to the other one, including the following situations: The classes of the two objects are joined by an association The receiving object is stored in a local variable of the sending method (but the objects are not yet joined by an association) A reference to the receiving object has been received as a parameter of an earlier message to the sender The receiving object is global The objects communicate over a network			instances of associations (i.e. links) in a class diagram	In a collaboration diagram, a line drawn between each pair of objects involved in the sending of a message
message in collaboration diagram		an arrow, labelled with the message name and optional arguments	a numbering scheme to indicate the order in which messages are sent

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