Apparatus and method for controlling process operations against conceptual structures formed of entities embodied on a complex infrastructure comprising tree structures of complex object nodes. The apparatus and method responds to a process request by selectively locking an entity to lock the entity...http://www.google.com.au/patents/US5063503?utm_source=gb-gplus-sharePatent US5063503 - Information control system for selectively locking an entity with requested intermediate reserve exclusive and share locks
