Data storage is performed using the formation of records having a keyfield which is a numeric concatenation of at least two identifiers. Preferably, the keyfield contains an identifier of entity type and an identifier of an attribute and, more preferably, also an identifier of entity--where entity type...http://www.google.de/patents/US5799308?utm_source=gb-gplus-sharePatent US5799308 - Method and apparatus for data storage and retrieval
