A variant on a context free grammar, in which the non-terminals correspond to semantic rather than syntactic concepts. A system of this type encodes semantic knowledge about the types of sentences likely to appear in the input in the grammar rules. For example, a system to handle text about ships and ports might encode in its grammar rules information about the subject of a sentence about "docking" must be a ship:
docksentence → shipnp dockvp
The problem with semantic grammar is that for coverage of a significant portion of a language, a huge number of rules would be required, and a massive analysis of the meanings that those rules could encode would be included in their development.
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