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This file provides a standardized way of associating alternative 

Gloss
SpacePreSpacetruefalse
tIdentifiers
from various schemes with
Gloss
PreSpacefalse
tSNOMED CT components
.

At any point in time , an alternative

Gloss
SpacePreSpacetruefalse
tIdentifier
within a particular scheme will be associated with one and only one
Gloss
PreSpacefalse
tSNOMED CT component
. A
Gloss
SpacePreSpacetruefalse
tSNOMED CT component
may be associated with zero or more alternative
Gloss
SpacePreSpacetruefalse
tIdentifiers
within a single scheme.

It is important to note that the

Gloss
SpacePreSpacetruefalse
tSNOMED CT component
and it's alternative
Gloss
SpacePreSpacetruefalse
tIdentifiers
all identify precisely the same real-world object.

Note: The Identifier file is not currently used in the

Gloss
SpacePreSpacetruefalse
tSNOMED CT International Release
as use of the more flexible
Gloss
SpacePreSpacetruefalse
tSimple map type references set
structure is preferred for links to alternative codes. The only known current use of this file is for internal identification of components during the content development process.

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Only one record with the same

Specref
RefType(field)
tidentifierSchemeId
and
Specref
RefType(field)
talternateIdentifier
fields will be current at any point in time. The current record will be the one with the most recent effectiveTime before or equal to the point in time under consideration.

If the

Gloss
SpacePreSpacetruefalse
tactive
field of this record is false ('0'), then the association is
Gloss
SpacePreSpacetruefalse
tinactive
at that point in time. If the
Gloss
SpacePreSpacetruefalse
tactive
field is true ('1'), then there is an identity at that point in time between the
Specref
RefType(field)
treferencedComponentId
 (a
Gloss
PreSpacefalse
tSNOMED CT component
) and the alternateIdentifier in the scheme identified by
Specref
RefType(field)
tidentifierSchemeId
.

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