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Within a Domain, codes come from a number of Vocabularies, and their codes have often identical or overlapping meanings. To bring order to this situation, each of them is assigned one of three designations:
For all Concepts in a Domain, this creates the following logical structure:
Source Concepts are mapped through a mapping mechanism to Standard Concepts, and these have relationships of various semantic natures to each other. In addition, they have hierarchical relationships to each other and the Classification Concepts, in this case derived from the Vocabularies A, B and C. Hierarchical relationships amongst Classification Concepts generally are only happening between Concepts of the same Vocabulary. All Concepts are stored in the CONCEPT table, all relationships in the CONCEPT_RELATIONSHP table and all generation-spanning hierarchical relationships in the CONCEPT_ANCESTOR table. The latter are only defined between Standard and Classification Concepts, Source Concepts do not participate in this hierarchical tree structure. ___
All elements in the Vocabularies have a representation as a Concept in the CONCEPT table. This results in three categories of Concepts:
The designation of a Concept as Standard, Classification or Source depends on the Vocabulary. See the specifications for each Vocabulary for details.