There are an additional four extensions to the graph representation which are useful in
practice, but which do not describe formally: views, constraints, operations and queries. A graph representation may be broken up into several diagrams, or views, which represent the various configurations in which the links may occur. Constraints include cardinality and type, and operations describe how data are stored and accessed.
There are an additional four extensions to the graph representation which are useful inpractice, but which do not describe formally: views, constraints, operations and queries. A graph representation may be broken up into several diagrams, or views, which represent the various configurations in which the links may occur. Constraints include cardinality and type, and operations describe how data are stored and accessed.
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