Explanation:
Attribute Grammars were invented by Don Knuth as a way to unify all of the stages of compiling into one. An attribute grammar links syntax with semantics and have values that hold semantic information about the (non)terminal.
They can perform several functions in specifying the syntax and semantics of a programming language, they can specify the context-sensitive aspects of the syntax of a language and operational semantics of a programming language.
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