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Once released, the unique

Gloss
PreSpacefalse
tIdentifiersidentifiers
of
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tSNOMED CT components
are persistent, and their
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tIdentifiersidentifiers
are not reused. When a
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tcomponentscomponent
becomes inactive this is indicated by the value of the
Specref
RefTypefield
tactive
field, which is present in all
Gloss
PreSpacefalse
tcomponents
.
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PreSpacefalse
tComponents
continue to be distributed even when they are no longer
Gloss
PreSpacefalse
tactive
. This allows a current release to be used to interpret data entered using an earlier release.

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