The Open Systems Interconnection (OSI) Model is a conceptual and logical layout that defines network communication used by systems open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below...
An object relational database management system (ORDBMS) is a database management system with that is similar to a relational database, except that it has an object-oriented database model. This system supports objects, classes and inheritance in database schemas and query language.
Object relational database management systems provide a middle ground between relational and object-oriented databases. In an ORDBMS, data is manipulated using queries in a query language. These systems bridge the gap between conceptual data modeling techniques such as entity relationship diagrams and object relational mapping using classes and inheritance. ORDBMSs also support data model extensions with custom data types and methods. This allows developers to raise the abstraction levels at which problem domains are viewed.
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