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The Computer Journal 1985 28(3):250-256; doi:10.1093/comjnl/28.3.250
© 1985 by British Computer Society
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Structuring two-level grammar specifications

M. H. Williams *

Department of Computer Science, Heriot-Watt University, 79 Grassmarket, Edinburgh, UK

The two-level grammar notation is a powerful tool for specifying the syntax, static semantics and even dynamic semantics of programming languages. However, it can also be a very difficult notation to follow. For this reason an approach to writing two-level grammars is advocated which explicitly indicates the ‘direction of propagation’ of metanotions. This suggests the requirement that the direction of propagation of each metanotion within a given hypernotion should be consistent and enables one to test a two-level grammar specification for circularity.


* Department of Computer Science, Heriot-Watt University, 79 Grassmarket, Edinburgh EH1 2HJ


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