Each Well Assembly is composed of assorted pipes, valves, and other attachments. To describe the composition of the Asset that is a Well Assembly, we’ll again borrow a portion of the model from the Asset presentation in Chapter 6. Specifically, in Figure 21-10, Well Assembly Structure is shown as a sub-type of Asset Structure. In fact, Asset Structure has been modified slightly from its original configuration. In this case, each Asset Structure is still the use in one Asset, but it is either the use of one (other) Asset or the use of one Asset Type. This is because the relationships from Well Assembly to either Piece of Equipment or Equipment Specification must be sub-types of the corresponding relationships to Asset Structure ...

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