Requirements-Terminology Model

A terminology model is a collection of terminology artifacts that, together, support defining the terminology constraints that can apply in standard specifications. The specific types of artifacts that a terminology model may contain include:

• Concept Domains
• Code Systems
• Value Sets
• Binding Realms
• Context Bindings
• Code Translations
• Code System Supplements

Note: The requirements for why each of the above artifacts are necessary are covered either elsewhere within this specification or in the requirements listed below.

Requirement	Terminology Models need to be able to be packaged and identified as a single artifact
Rationale	While made up of multiple distinct parts, there are significant dependencies between all of the aspects of a set of terminology artifacts. Specifications need to be able to easily reference the set of terminology artifacts that apply to them. The easiest way to do that is to define a single "package" containing all of the terminology artifacts that can be updated from time to time and which can be referenced either as a specific version of the package or as "the current package".
Methodology	mif-vocabulary-model.xsd/VocabularyModel
OMG Mapping	Stereotyped UML Package.

Requirement	Terminology models must identify any other terminology models they are dependent on
Rationale	Because of the vast number of code systems, value sets, mappings and other terminology artifacts that will exist and the wide variety of organizations that create and maintain those artifacts, it is unrealistic to expect that all terminology artifacts could possibly be encompassed or published within a single model. Multiple models are inevitable. However, most models will have dependencies on contents that are in turn defined within other models. (In some cases, the dependencies may be circular). Understanding the models a given terminology model depends on is therefore essential to being able to use that model.
MIF	mif-vocabulary-model.xsd/VocabularyModel	OMG Mapping	UML already provides for importing of packages. However, such importation is necessary only to make names within the imported package visible without qualification -- it is allowable to reference elements within a package without importing it. Nevertheless, stereotyped UML import relationships could be used to represent the above HL7 dependencies.

Requirement	When persisting or exchanging a representation of a terminology model, there are various degrees of detail that may need to be exposed and the persisted artifact needs to indicate what level of representation is present.
Rationale	Some terminology models may be intended for "publication" and therefore provide a more limited view. Others will have been constrained to only show a subset of the artifacts that exist within the model. It's important when looking at a given model representation whether you're looking at the "whole thing" or only a subset.
Methodology	Possible levels are: complete: Indicates that the content of the model rendition represents a complete definition of the vocabulary artifacts present within that model. partial-validation: Indicates that the content of the model rendition represents a subset as required for validation of static model definitions. This representation may include artifacts defined within other models rather than referencing them as dependent models for simplicity of exchange. partial-publishing: Indicates that the content of the model rendition represents a subset as required to expose the vocabulary model for publishing partial-implementation: Indicates that the content of the model rendition represents the subset needed to perform implementation of a particular set of static artifacts. This representation may include artifacts defined within other models rather than referencing them as dependent models for simplicity of exchange.
MIF	mif-vocabulary-model.xsd/VocabularyModel/@definitionKind	OMG Mapping	Tagged value on a Package stereotype.

Requirement	Terminology Models may have a number of different types of annotations
Rationale	See rationales for individual annotations types
Implementation	Description Usage Constraint Usage Notes Requirements Design Comments Stability Remarks Appendix Other Annotation Open Issue Ballot Comment Change Request Deprecation Information	OMG Mapping	Tagged values on a Package stereotype.