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Comment: Added link to wikipedia on Eiffel

Key-value coding is a way to separate interfaces and a way to flexibly access data and methods in object instances. The concept has a long history. It appeared in Eiffel, and other places as well. If you are familiar with OGNL then you will know it from there also. We'll call key-value coding KVC in the context of this page to abbreviate. KVC also exists in the Cocoa infrastructure shipped with MacOS-X, having evolved from OPENSTEP and the development tools created for it. In this page we will focus on KVC in the context of WebObjects and java.

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Consider the following model segment;:

This model shows a number of entities and the lines between the entities show relationships. For example, the Organisation entity has a to-one relationship with a Worker called "workerAccount" and it also has a "to-many" relationship to "OrgRegion" called "orgRegions".

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