This section describes four categories of reference set types, each of which contain several sub-types.

Each reference set type follows a pattern and that pattern is also represented in a machine readable form using a set of Reference Set Descriptor members (known as a Descriptor Template, for short). In most case, the same pattern may be used to define a number of different reference sets to serve a variety of purposes. However, there are also some highly specific reference set types that exist for a single specified purpose. These are the  Reference Set Descriptor Reference SetModule Dependency Reference Set and  Description Format Reference Set.

In each subsection, a reference set type is described under the following subheadings:

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