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Write the syntax and semantics of datalog language

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Answer 2

Syntax and semantics of datalog language:

The following are 'syntax' and semantics of datalog language.

• A variable begins with an uppercase letter.
• A constant is a sequence of digits or begins with a 'lowercase letter'.  
• A 'term' is either a constant or a variable.
• A predicate symbol begins with a 'lowercase' letter.
• An 'atomic symbol (atom)' is of the style 'p or p(t1, . . . , tn)' where p is a 'predicate symbol' and ti are terms.
• A 'definite clause' is either an 'atomic' symbol of a fact.
• A knowledge base is a group of 'definite clauses'.

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