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Description	Select a set of concepts based on subsumption testing
Property Name	concept
Operations Allowed	is-a
Values Allowed	[concept id]
Comments	Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value (including the concept itself)
Example	Administration Methods
SCT ECL	<< [concept] (or the long formLong syntax: descendantOrSelfOf [concept])

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Description	Select a set of concepts based on their membership of a SNOMED CT reference set
Property Name	concept
Operations Allowed	in
Values Allowed	[concept id]
Comments	Includes all concept ids that are active members of the reference set identified by the concept Id provided as the value
SCT ECL	^ [concept] (or the long(Long formsyntax: memberOf [concept])

4.2.1.0.6.3 By SNOMED Query

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Expression Constraint Image Modified

 "compose": {
  "include": [
    {
      "system": "http://snomed.info/sct",
      "filter": [
        {
          "property": "constraint",
          "op": "=",
          "value": "<< 30506011000036107 |Australian product|: 700000101000036108 |hasTP| = 17311000168105 |Panadol|"
        }
      ]
    }
  ]
}

   

4.2.1.0.6.4 By whether

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postcoordination is allowed Image Modified

Description	Specify whether post-coordination postcoordination is allowed or not
Property Name	expressions
Operations Allowed	=
Values Allowed	true or false
Comments	Expressions, if allowed, are subject to the same rules as pre-coordinated precoordinated concepts. (Note: simple reference sets do not include expressions, but Query specification reference sets might).
Example	Administration Methods
SCT ECL	n/a

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• the base URL is either "http://snomed.info/sct", or the URI for the edition version, in the format specified by the IHTSDO SNOMED International the SNOMED CT URI Specification 
• a query portion that specifies the scope of the content

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<ValueSet xmlns="http://hl7.org/fhir">
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
     [Some HTML that describes this value set as all concepts in the reference set identified by conceptid]
    </div>
  </text>
  <url value="[edition/version]?fhir_vs=refset/[sctid]"/>
  <version value="[edition/version]"/>
  <name value="SNOMED CT Reference Set [conceptid]"/>
  <description value="All SNOMED CT concepts in the reference set [concept id or preferred description]"/>
  <copyright value="This value set includes content from SNOMED CT, which is copyright © 2002+ International Health Terminology Standards Development Organisation (IHTSDO), and distributed by agreement between IHTSDO and HL7. Implementer use of SNOMED CT is not covered by this agreement"/>
  <status value="active"/>
  <compose>
    <include>
      <system value="http://snomed.info/sct"/>
      <filter>
        <property value="concept"/>
        <op value="in"/>
        <value value="[conceptid]"/>
      </filter>
    </include>
  </compose>
</ValueSet>

4.2.1.0.8 Implicit Concept Maps 

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• the base URL is either "http://snomed.info/sct", or the URI for the edition version, in the format specified by the IHTSDO SNOMED International in the SNOMED CT URI Specification 
• a query portion that specifies the scope of the content

...

<ConceptMap xmlns="http://hl7.org/fhir">
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml">
     [Some HTML that describes this concept map]
    </div>
  </text>
  <url value="[edition/version]?fhir_cm=[sctid]"/>
  <version value="[edition/version]"/>
  <name value="SNOMED CT [name] Concept Map"/>
  <description value="The concept map implicitly defined by the [name] Association Reference Set"/>
  <copyright value="This value set includes content from SNOMED CT, which is copyright © 2002+ International Health Terminology Standards Development Organisation (IHTSDO), and distributed by agreement between IHTSDO and HL7. Implementer use of SNOMED CT is not covered by this agreement"/>
  <status value="active"/>

  <sourceUri value="[edition/version]?fhir_vs"/>
  <targetUri value="[edition/version]?fhir_vs"/>
  <group>  <!-- 0..* Same source and target systems -->
    <source value="http://snomed.info/sct"/>
    <sourceVersion value="[edition/version]"/>
    <target value="http://snomed.info/sct"/>
    <targetVersion value="[edition/version]"/>

    <!-- a mapping for each member of the reference set -->
    <element>
      <code value="[member]"/>
      <target>
        <code value="[reference set value]"/>
        <equivalence value="[relationship]"/>
      </target>
    </element>
  </group>
</ConceptMap>

Simple Map Reference Sets  (reference sets which are descendants of 900000000000496009 "Simple map") also define an implicit concept map. However, at this time, these cannot be converted to Concept Maps because there is no source for the target code system . Another reference set has been proposed to SNOMED International, and this section will be revisited once it is adopted.used by the map is not yet defined in a computable way.