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Abstract Syntax Definitions

Abstract syntax is studied at the word level.

<expression > ::=
    <numeral > |
    <expression > <operator ><expression > |
    left-paren <expression > right-paren
<operator > ::= plus | minus | mult | div
<numeral > ::= zero | one | ... | ninety | ...

Structure remains, text vanishes.


Author: Wolfgang Schreiner
Last Modification: October 13, 1997

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