FactGrid:Troubleshooting

A knows B

We would like to offer the greatest variety of contact information.

• We are presently presenting some 9.000 documents with information about senders and the respective receivers
• We are listing some 300 events with information about participants
• We could add specific contact information in the form of "A meets B" statements - we could just as well create items for any known meeting.

How do we organise such information in a way that database queries can offer us contact information with the greatest ease? How do we avoid recursive statements ("Person A meets Person B" - do we have to repeat the statement as "Person B meets Person A", and if so, how do we ensure the congruence)?