This is the Continuous Integration Build of FHIR (will be incorrect/inconsistent at times).
See the Directory of published versions icon CodeSystem http://hl7.org/fhir/type-derivation-rule

FHIR Infrastructure icon Work Group Maturity Level: NNormative (from v4.0.0) Use Context: Country: World
Official URL: http://hl7.org/fhir/type-derivation-rule Version: 6.0.0-cibuild
active as of 2021-01-04 Computable Name: TypeDerivationRule
Flags: CaseSensitive, Complete. All codes ValueSet: Type Derivation Rule OID: 2.16.840.1.113883.4.642.4.674

This Code system is used in the following value sets:

How a type relates to its baseDefinition.

This case-sensitive code system http://hl7.org/fhir/type-derivation-rule defines the following codes:

specialization SpecializationThis definition defines a new type that adds additional elements and optionally additional rules to the base type.btn btn
constraint ConstraintThis definition adds additional rules to an existing concrete type.btn btn


See the full registry of code systems defined as part of FHIR.

Explanation of the columns that may appear on this page:

LevelA few code lists that FHIR defines are hierarchical - each code is assigned a level. See Code System for further information.
SourceThe source of the definition of the code (when the value set draws in codes defined elsewhere)
CodeThe code (used as the code in the resource instance). If the code is in italics, this indicates that the code is not selectable ('Abstract')
DisplayThe display (used in the display element of a Coding). If there is no display, implementers should not simply display the code, but map the concept into their application
DefinitionAn explanation of the meaning of the concept
CommentsAdditional notes about how to use the code