TBase - Connecting the Nodes

How do Drupal's nodes relate to each other? Assuming nodes with type of 'person', 'group' and 'product', how can we express...
...that person Fred is A_MEMBER_OF group Salesforce since 1989 and that he became LEADER_OF group Salesforce in 1995.
...that person Fred is A_COLLEAGUE_OF person John and A_SUPERVISOR_OF person Bill.
There are no limits to how the model of an organization might evolve and what might become relevant: For example, we also might want to track...
...that person Bill HAS_BOUGHT product DrupalBook on Oct. 17, 2005 for $19.95.

Similar to the node table that allows us to keep track of new node instances, often we need a transaction table that allows us to relate 2 nodes to each other. TBase attempts to provide such a solution.

A quick introduction to TBase using commented screen shots may be found here.