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Information Modeling: The EXPRESS Way$
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Douglas Schenck and Peter Wilson

Print publication date: 1994

Print ISBN-13: 9780195087147

Published to Oxford Scholarship Online: November 2020

DOI: 10.1093/oso/9780195087147.001.0001

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Chapter 16 EXPRESS Syntax
Information Modeling: The EXPRESS Way

Douglas Schenck

Peter Wilson

Oxford University Press

Here is the entire syntax except for constant tokens (i.e., reserved words and such), character sets, standard constants, functions and procedures, and simple equates to tokens that create or reference identifiers. The following conventions will help to interpret the syntax presentation: • Identifiers written in upper case letters are keywords of the language. For example, when you see SCHEMA this means that the word ‘schema’ must be written at this place (using mixed case if you wish.) The names of these syntax productions are identical to the keywords of the language. • Elements that follow the pattern xxxDef represent an identifier declaration. For example, VarDef shows where a variable declaration takes place. This also implies that the name created at this place is subject to the scoping rules that apply to the object in question. • Elements that follow the pattern xxxRef represent a reference to some explicit definition. For example, a VarRef requires a VarDef.

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