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Enterprise Model Patterns: Describing the World (UML Version) by David C. Hay

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As originally contracted, an Instrument is ultimately an order for services (purchased as a product), although it may be an order for other Instruments. So, how do we record delivery of instances of these services?

An Instrument is unique as a kind of Contract, in that fundamentally, delivery of an instance of the ordered Instrument Specification is often either the Instrument itself or another Instrument. You set up a checking account. This is basically an order for a checking account. By definition you have received what was ordered. In addition, if the Instrument (for example “Executive Account #30893790”, held by Mark MacHogan) is composed of an Instrument Component that is to order another Instrument Specification ...

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