Codelist extensions

• The extension type defines the additional properties that can be linked to the code list and their semantics.
• Currently, around ten different extension types are available in the Reference Data tool, each of them linking their own views and/or data fields as part of the code list.
• The supported extension types have been described in more detail in the section Supported extension types.

• The properties provided by the extension type are activated by creating an extension to the codelist.
• An extension is created to the codelist and a suitable extension type is selected for it according to which additional properties are needed for the codelist.

• The actual content of the extension consists of members.
• A member contains the additional information fields defined by the extension type as well as references to codes.

• Make it possible to compile hierarchic structures of codes.
• Link predetermined information fields to the members of the hierarchy, for example, the name and similar specifiers.
• They are quite versatile and can be used widely in various use cases to structure existing codes.
• Do not impose restrictions on the number of extensions of the same extension type in one code list.

• Extend the code with predefined data fields.
• Have typically been tailored for a specific purpose and restrict the permitted values of fields.
• Impose the restriction that there can be only one extension of a certain extension type in one code list.

Definition hierarchy

Hierarchy extension

Enables the creation of an alternative hierarchy of codes. The hierarchy can incorporate codes from one or multiple code sets, and from each code set either the entire set or a selected subset of codes can be included. Each member of the hierarchy can be assigned a descriptive label to clarify its role within the hierarchy.

Calculation hierarchy

Hierarchy extension

Functionally equivalent to the Definition hierarchy extension, but additionally supports defining aggregation and comparison operators for each member of the hierarchy

Code map

Hierarchy extension

Enables the creation of one-way linkage between codes. The codes to be linked may come from one or more codelists.

DPM Metric

Code extension

Adds the fields required by the Metric concept defined in the Data Point Modeling (DPM) methodology to the code’s data structure. This enables representing DPM Metric concepts as codes within the Reference Data tool.

DPM Explicit Domain

Code extension

Functionally equivalent to the DPM Metric extension but includes the fields required by the DPM Explicit Domain concept.

DPM Typed Domain

Code extension

Functionally equivalent to the DPM Metric extension, but includes the fields required by the DPM Typed Domain concept.

DPM Dimension

Code extension

Functionally equivalent to the DPM Metric extension, but includes the fields required by the DPM Dimension concept.