正文
获取原文件references/omop-maps-to-policy.md
Use active CONCEPT_RELATIONSHIP records with relationship_id = Maps to.
- Standard Concepts may map to themselves.
- Non-standard Source Concepts may map to one or many Standard Concepts.
- Preserve one-to-many mappings.
- Preserve
Maps to valueseparately. - Downstream OMOP domain follows the mapped Standard Concept's
domain_id. - Classification or unmapped concepts are not silently coerced.