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An attribute value reference set is a component reference set used to apply a tagged value to a SNOMED CT component. The pattern of the attribute value reference set is similar to that of the association reference set, despite the fact that the components referenced in the valueId attribute must be a subtype of the concept 

900000000000491004 | Attribute value |, 

An 900000000000480006 | Attribute value type reference set | allows a value from a specified range to be associated with a component. This type of reference set can be use for a range of purposes where there is a requirement to provide additional information about particular concepts, descriptions or relationships. In the International Edition of SNOMED CT an 900000000000480006 | Attribute value type reference set | is for example used to indicate the reason why components have been inactivated. 

• Scg expression
  900000000000489007 | Concept inactivation indicator attribute value reference set (foundation metadata concept) |

• Scg expression
  900000000000490003 | Description inactivation indicator attribute value reference set (foundation metadata concept) |

• Scg expression
  900000000000547002 | Relationship inactivation indicator attribute value reference set (foundation metadata concept) |

Refset Specific Attributes

900000000000491004 | Attribute value |.