Specification Method
When following the (Stream) X-Machine methodology, the first stage is to identify the various types of data to be processed. For example, a word processor will use basic types Character (keyboard input), Position (mouse cursor position) and Command (mouse or menu command). There may be other constructed types, such as Text ::= Character* (a sequence of characters), Selection ::= Position × Position (the start and end of the selection) and Document ::= Text × Selection × Boolean (the text, a possible selection, and a flag to signal if the document has been modified).
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