A case frame is a lexical definition for a word sense that tells how other phrases are related to it. A case frame might include:

• Selection Restrictions: restrictions on the possible slot fillers for the frame.

• Semantic Structure: how to build an output structure to represent the meaning.

• Related Phrases: how certain phrases, e.g. prepositional phrases, may fit into the meaning.

HIT-1   < subj>   +animate
        < obj>    +concrete
        [with < inst>   +concrete,-animate]

-->    STRIKE   AGENT      < subj> 
               THEME      < obj> 
               INSTRUMENT < inst> 

Similar patterns work well for prepositions:

< person>  WITH < person> 
< location>  OF < object> 

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