Technical Report Number
This report introduces the idea of expressing programming concepts in a two-dimensional (pictorial) language. A specific two-dimensional language, Show and Tell, is briefly presented and formalisms that might be used to define the syntax of such a language are discussed. An abstraction of Show and Tell is defined, and a specific grammar formalism is presented for defining the syntax of this abstraction. The mechanisms found in expert systems are shown to be sufficient to parse languages defined by this formalism.
Gillett, Will D. and Kimura, T. D., "The Syntax and Parsing of the Two-Dimensional Languages" Report Number: WUCS-86-14 (1986). All Computer Science and Engineering Research.