Syntax

• Concrete Syntax defines the way the language is actually written on paper or on a screen and includes sufficient information to parse it.

• Abstract Syntax specifies the relations between logical parts of a the language, it can be simpler and may not contain enough information to parse the language unambiguously.

• Example:

y ::= if e then y else y fi concrete

y ::= if e then y else y abstract

y ::= e y , y abstract

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