Semantic grammar is between ELIZA and a more general English grammar. It uses a grammar in which nonterminal symbols have meaning in the domain of application.

< S>      -->   WHAT < CUST>  ORDERED < PART> 
              < MODS> 
< CUST>   -->   CUSTOMER | CUSTOMERS < LOC> 
< LOC>    -->   IN < CITY> 
< CITY>   -->   AUSTIN | SEATTLE | LA
< PART>   -->   WIDGETS | WIDGET BRACKETS
< MODS>   -->   IN < MONTH>  | BEFORE < MONTH> 
< MONTH>  -->   JANUARY | FEBRUARY | MARCH

WHAT CUSTOMERS IN AUSTIN ORDERED
  WIDGET BRACKETS IN MARCH

• More coverage with fewer patterns.

• No ambiguity due to use of semantic phrases.

• Easy to program.

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