Yeah, typeless is no problem in this case. I don't know SQLite at all, but as long as it can do sub-selects ( the IN ( SELECT ...) part ), it should be fine. I'm not sure when you say 'structure this' if you mean the database, or the Perl code. The Perl code probably needs to be set up as a shell, where you can make assertions (which will be written to the database) ask questions (which will query the database), and do housekeeping (save db, restore db, wipe db, quit, etc.) Like a PROLOG interpreter.
The only interesting thing I'd worry about with the database to start with would be using serial numbers instead of names when describing relationships, so that you can rename things if necessary. (Without this, renaming breaks all relationships.) Next might include quantities ( book worth 5 shekels ). Note that you don't need to add classes to the database, you can simply add the 'is a' relationship, and ( 1984 is a book ) works.
Spring: Forces, Coiled Again!
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