July 2013 Archive

Relationships in ODL / Inverse Relationships

While we can learn much about an object by examining its attributes, often a critical fact about an object is the way it connects to other objects in the same or another class.

Multiplicity of Relationships

Like the binary relationships of the E/R model, a pair of inverse relationships in ODL can be classified as either many-many, many-one in either direction, or one-one. The type declarations for the pair of relationships tells us which.

Methods in ODL

The third kind of feature of ODL classes is the method. As in other object-oriented languages, a method is a piece of executable code that may be applied to the objects of the class.

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