What is ofUserProp table for? anything to store personal data?

Hi,

I’m just wondering where I can store the user data as just data not xml with the key because a server side program will query that data indivisually.

I thought of using Private XML Storage, however, it’s only allowed to store data as XML so there is a difficulty to query the data itself.

But I found ofUserProp table in openfire. what is it for? it seems to me that I can store something like key-value set

Anyone knows it? and any recommendation for my requirement above? Key-value set for each user.