SPATIAL DATABASES

Basic components of and object oriented modeling are classes, attributes,methods,and relationships.

Classes: Encapsulation of objects that share properties
Attributes: Unlike ER, there is no notion of keys. Attributes can be of three types:

• Public
• Private
• Protected

Methods: They define access, updates and operations with objects
Relationships: Derived from basic abstraction mechanisms:

• aggregation
• generalization
• associations

 

UML is a well known language that allow the specification of object oriented conceptual model.

 

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