active database associative model of data backup bell labs brown university c object processor comparison of object database management systems concept-oriented model database models database trigger declarative programming deductive database document-oriented database encapsulation enterprise objects framework financial services flat file database hierarchical model ibm intersystems interoperability java community process java data objects language integrated query list of database models microelectronics and computer technology corporation molecular biology native queries navigational database network model object-based spatial database object-oriented programming object-oriented programming language object-relational database object-relational impedance mismatch objectstore object data management group object management group object query language objective-c online analytical processing open source particle physics persistence perst progress software query language real-time computing recovery relational database relational model semantic data model smalltalk star schema temporal database xforms xml database xquery