Appendix E - Reference Set Fields

In the SNOMED CT Release File Specification (http://snomed.org/rfs), SNOMED International specifies a set of reference set types with their own specific properties (e.g. an attribute value type reference set). Each reference set that is developed to conform to a specified type is defined as a subtype of the associated reference set type concept (e.g. 900000000000480006 | Attribute value type reference set| ). All reference sets of a given type are populated with members using the same data structure - with the same set of field names in the same order. SNOMED International uses these reference set type data structures (as defined in the SNOMED CT Release File Specification ) as the release file format for all reference sets of that type.

All reference set type concepts are a subtype of 900000000000455006 | Reference set| , and have an associated set of reference set descriptors in the | Reference set descriptor reference set| . Some reference set type concepts are organised under one or more reference set groups (e.g. 723564002 | MRCM reference set| ), which represent a group of reference set types (often with different data structures).

In the Expression Constraint Language (v2.0+) reference set field names are used to indicate which field values to return, and to filter reference set members based on specific field criteria. The first (non-metadata) field in every reference set (in order '0') must always be 'referencedComponentId'. For reference sets, which are a subtype of an international reference set type, the additional field names defined in the SNOMED CT Release File Specification must be used. In all other cases, the additional field names may use any latin-script alphabetic character (a-z or A-Z) defined by the owner of the corresponding reference set type concept. Owners of a reference set type are encouraged to explicitly document these field names, keep them unchanged and publish a machine readable representation of these (following the format used below). In the absence of this, the column name from the corresponding RF2 file (with all whitespace removed) will be used.

The international reference set types and their corresponding list of field names to be used in ECL v2.0+ are shown in the table below (for information only). A normative, computable representation of this table is attached below the table. Please note that this file may be extended by implementers with national or local reference set types.

Reference Set Types

Content Reference Set Types

Reference Set Type	Field Names
446609009 | Simple type reference set|	referencedComponentId
733619002 | Ordered component type reference set|	referencedComponentId, order
900000000000480006 | Attribute value type reference set|	referencedComponentId, valueId
900000000000521006 | Association type reference set|	referencedComponentId, targetComponentId
733618005 | Ordered association type reference set|	referencedComponentId, targetComponentId, order
900000000000516008 | Annotation type reference set|	referencedComponentId, annotation
900000000000512005 | Query specification type reference set|	referencedComponentId, query
447258008 | Ordered type reference set|	referencedComponentId, order, linkedToId
762676003 | OWL expression type reference set|	referencedComponentId, owlExpression
1119417006 | Postcoordinated expression type reference set|	referencedComponentId, expression, substrate

Language Reference Set Types

Reference Set Type	Field Names
900000000000506000 | Language type reference set|	referencedComponentId, acceptabilityId

Map Reference Set Types

Reference Set Type	Field Names
900000000000496009 | Simple map from SNOMED CT type reference set|	referencedComponentId, mapTarget
1187636009 | Simple map to SNOMED CT type reference set|	referencedComponentId, mapSource
447250001 | Complex map from SNOMED CT type reference set|	referencedComponentId, mapGroup, mapPriority, mapRule, mapAdvice, mapTarget, correlationId
609331003 | Extended map from SNOMED CT type reference set|	referencedComponentId, mapGroup, mapPriority, mapRule, mapAdvice, mapTarget, correlationId, mapCategoryId
705111002 | Map to SNOMED CT with correlation and origin type reference set|	referencedComponentId, mapSource, attributeId, correlationId, contentOriginId
705109006 | Code to expression type reference set type reference set|	referencedComponentId, mapSource, expression, definitionStatusId, correlationId, contentOriginId
1193542003 | Simple map with correlation from SNOMED CT type reference set|	referencedComponentId, mapTarget, correlationId
1193543008 | Simple map with correlation to SNOMED CT type reference set|	referencedComponentId, mapSource, correlationId
1193544002 | Simple map with correlation from SNOMED CT to SNOMED CT type reference set|	referencedComponentId, mapTarget, correlationId

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Metadata Reference Set Types

Reference Set Type	Field Names
900000000000456007 | Reference set descriptor type reference set|	referencedComponentId, attributeDescription, attributeType, attributeOrder
900000000000534007 | Module dependency type reference set|	referencedComponentId, sourceEffectiveTime, targetEffectiveTime
900000000000538005 | Description format type reference set|	referencedComponentId, descriptionFormat, descriptionLength
723589008 | MRCM domain type reference set|	referencedComponentId, domainConstraint, parentDomain, proximalPrimitiveConstraint, proximalPrimitiveRefinement, domainTemplateForPrecoordination, domainTemplateForPostcoordination, guideURL
723604009 | MRCM attribute domain type reference set|	referencedComponentId, domainId, grouped, attributeCardinality, attributeInGroupCardinality, ruleStrengthId, contentTypeId
723592007 | MRCM attribute range type reference set|	referencedComponentId, rangeConstraint, attributeRule, ruleStrengthId, contentTypeId
723563008 | MRCM module scope type reference set|	referencedComponentId, mrcmRuleRefsetId

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Field Names of International Reference Set Types - ECL 2.0.tsv