View definition

In addition to ad-hoc queries defined in terms of OQL queries OSI supports defining views as part of the schema definition. A view definition is a structure definition, which provides computation rules for each view element and for the view extent.

Views can be defined as transient, temporary or persistent views. ODABA views do not need a fixed data source, which allows applying views on different collections. Thus, a view is a structure definition on the one hand, but also a method definition on the other hand.

A view definition consists of the view header and the view definition. Several of the class header properties are shared with other type definitions and are described in topic "Type extensions":

• Type properties
• Inheritance specifications