Object Definition Language (ODL) is the specification language defining the interface to object types conforming to the ODMG Object Model

Object model

In computing, object model has two related but distinct meanings:# The properties of objects in general in a specific computer programming language, technology, notation or methodology that uses them. For example, the Java objects model, the COM object model, or the object model of OMT...

. Often abbreviated by the acronym ODL.

This language's purpose is to define the structure of an Entity-relationship diagram.

Class declarations

Interface < name > { elements = attributes, relationships, methods }

Element Declarations

attributes ( < type > : < name > );

relationships ( < rangetype > : < name > );

Example

Type Date Tuple {year, day, month}
Type year, day, month integer

Class Manager
attributes(id : string unique
name : string
phone : string
set employees : Tuple { [Employee], Start_Date : Date })

Class Employee
attributes(id : string unique
name : string
Start_Date : Date
manager : [Manager])