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subsystem diagram
subject			fact

subsystem diagram	has definition A UML diagram showing details of a subsystem, including aspects of its operations, its specification and its realization
	is a subtopic of 9.4 - Software Architecture
	is a kind of UML diagram
UML diagram	describes aspects of the architectural model
	has part constraint
	has part note
	see also Unified Modelling Language
	shows classes, their attributes and operations as well as the various types of relationships that exist among the classes
diagram	has advantages it conveys or summarizes complex concepts or mechanisms more easily than other techniques
	has problems can be hard for users to interact with or interpret not usable by blind people it can be expensive to program diagram drawing software
	should have a label if its meaning is not obvious, using a caption or pop-up label that appears when the user moves the mouse over it