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Enlarged convention table in CONCEPT.md

clairblacketer 2019-04-10 12:43:03 -04:00
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StandardizedVocabularies/CONCEPT.md

@ -21,7 +21,7 @@ Field|Required|Type|Description
Concepts in the Common Data Model are derived from a number of public or proprietary terminologies such as SNOMED-CT and RxNorm, or custom generated to standardize aspects of observational data. Both types of Concepts are integrated based on the following rules:
No.|Convention Description
:--------|:------------------------------------
:--------|:---------------------------------------------------------------------
| 1 | All Concepts are maintained centrally by the CDM and Vocabularies Working Group. Additional concepts can be added, as needed, upon request. |
| 2 | For all Concepts, whether they are custom generated or adopted from published terminologies, a unique numeric identifier concept_id is assigned and used as the key to link all observational data to the corresponding Concept reference data. |
| 3 | The concept_id of a Concept is persistent, i.e. stays the same for the same Concept between releases of the Standardized Vocabularies. |