The Instrument Type List Dictionary provides a set of permissible values and their value meanings for use by the enumerated attribute type in the Instrument class. Modification History: 2019-11-14: First version delivered by the Instrument Type Steward Team. The Type List class provides a list of values and their value meanings. This section contains the simpleTypes that provide more constraints than those at the base data type level. The simpleTypes defined here build on the base data types. This is another component of the common dictionary and therefore falls within the common namespace. The subtype attribute provides additional nuance or clarity to the type attribute. The type attribute provides a character string which uniquely identifies the object.