Where the Instrument Specification Structure described the Services that are defined to be part of an Instrument Specification, the actual features of a real Instrument are specified through a set of Instrument Components. Each Instrument may be composed of one or more Instrument Components, each of which must be to order either one Service or one Instrument Specification.

Some of the components (primarily Services) described for an Instrument Specification through its Instrument Specification Structure instances are optional. These are designated by the attribute of Instrument Specification Structure, Mandatory Indicator. Where some services are optional for the Instrument Characteristic, the entity class Instrument Component ...

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