Object-relational database

An object-relational database (ORD), or object-relational database management system (ORDBMS),
is a database management system (DBMS) similar to a relational database,
but with an object-oriented database model: objects, classes and inheritance
are directly supported in database schemas and in the query language.
In addition, it supports extension of the data model with custom data-types and methods.

An object-relational database can be said to provide
a middle ground between relational databases and object-oriented databases (OODBMS)



Sumber:
* http://en.wikipedia.org/wiki/Object-relational_database
* http://en.wikipedia.org/wiki/File:Object-Oriented_Model.jpg