I want to do a riddle AI chatbot for my AI class. So i figgured the input to the chatbot would be :

Something like : "It is blue, and it is up, but it is not the ceiling"

Translation :

<Object X>
    <blue>
    <up>
    <!ceiling>
</Object X>

(Answer : sky?)

So Input is a set of characteristics (existing \ not existing in the object), output is a matched, most likely object.

The domain will be limited to a number of objects, i could input all attributes myself, but i was thinking :

How could I programatically build a database of characteristics for a word? Is there such a database available? How could i tag a word, how could i programatically find all it's attributes? I was thinking on crawling wikipedia, or some forum, but i can't see it build any reliable word tag database.

Any ideas on how i could achieve such a thing? Any ideas on some literature on the subject?

Thank you