Your OP didn't mention prepositions, so I didn't even think about them. At that point you're really looking for something more like a natural language parser. A quick wander through CPAN finds Lingua::EN::Tagger which might help.

The post giving an example of a Prolog interface from Perl is also worth looking at, as all the heavy lifting has already been done in Prolog.

Something else that might help would be to look at the MUSH code, which had a rich object-oriented environment, and could at least store the kind of state information you're describing, and much more. The queries would be interesting. PennMUSH seems to be the current MUSH implementation of choice.

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