The range of permitted values for each of the concept enumerations is the set of subtypes of a specified concept which is itself a subtype of 900000000000442005 | Core metadata concept (core metadata concept)| . The current set of concept enumeration types is shown in Table Appendix E:-1. The values of each of these and the ways they should be used in implemented systems are described in the following subsections.
Each subtype of this concept represents a value that can be applied to the description.caseSignificanceId field. This is used to indicate whether the text of the term can be modified to by switching characters from upper to lower case (or vice-versa).
Each subtype of this concept represents a value that can be applied to the relationship.characteristicTypeId field. This is used to indicate whether a relationship forms part of the definition of the source concept.
Each subtype of this concept represents a value that can be applied to the identifier.identifierSchemeId field. This is used to indicate the scheme to which the identifier value belongs.
Note: Many of the concept enumerations include values that significantly impact the meaning or use of a component. Therefore, implementers may find it necessary to partially hard-code the way their systems process particular values. In these cases, the concept referenced by the value is only of value when there is a requirement to display a human readable rending of the value. The main exceptions to this are 900000000000443000 | Module (core metadata concept)| and 900000000000453004 | Identifier scheme (core metadata concept)| both of which represent extensible sets of values as new modules or alternative identifier schemes may be added in local Extensions .