Abstract
Diagrams are often used as part of the software development process. This paper discusses how the formal specification language Z Schema Calculus may be used to specify those diagrams which are, mathematically, speaking, graphs — i.e. they consist of nodes and arcs. General aspects of visual language specification are considered, and the examples of Yourdon data-flow diagrams and Jackson data structure diagrams are used to illustrate possible techniques. The necessary extensions to cover various more complex diagrams such as those used by Mascot 3 and higraphs are considered.
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