Object-Oriented data model provides possibility of various types of information utilization in a real world computing, therefore database system should have a capability of incomplete information management.
To define an object-oriented data model, w...
Object-Oriented data model provides possibility of various types of information utilization in a real world computing, therefore database system should have a capability of incomplete information management.
To define an object-oriented data model, we use the O_(2) Object-oriented database system, and suggest some representation for incomplete information manipulation. O_(2) is an object-oriented database system in which information is organized as an object with an identity, encapsulate data and behavior. Incomplete information can be expressed within an object instance using null value. Some interesting analogies are shown in the way that nested relational data model and the object-oriented model express empty set.