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Excerpt

Purpose

The 

Concept
ShowPartsterm
t705109006 Code to expression type reference set
 is designed to enable associations between code in another code system 
Gloss
t(other-codes)
t:other-codes
 and 
Gloss
tSNOMED CT concepts
, where the following constraints apply:

  1. Some of the 
    Gloss
    tother-codes
    t:other-codes
     cannot be mapped to an individual SNOMED CT 
    Gloss
    tconcept
    .
  2. Licensing conditions (or other considerations) prevent addition of new SNOMED CT concepts to represent the same meaning as the 
    Gloss
    tother-codes
    t:other-codes
    .
  3. The 
    Gloss
    tother-codes
    t:other-codes
     can be logically defined using the 
    Gloss
    tSNOMED concept model
     to represent the same meaning 
    Gloss
    t(sufficiently defined)
     or a similar though less specific meaning 
    Gloss
    t(primitive)
    .
  4. Other requirements similar for those applicable to mapping may also apply including:
    1. An indication of the degree of correlation between the  
      Gloss
      tother-code
      t:other-codes
       and the SNOMED CT expression.
    2. An indication of whether the 
      Gloss
      tother-code
      t:other-codes
       was created before any single concept representation of that meaning in SNOMED CT or whether the single concept representation in SNOMED CT predated the creation of the association.

Data Structure

The general approach to the above requirements is to associate each of the 

Gloss
tother-codes
t:other-codes
 with a representation of the same logic based definition as would have been applied to a SNOMED CT concept with that meaning. However, since the  
Gloss
tother-code
t:other-codes
 are not identified by an  
Specref
RefTypedata type
tSCTID
, the logical definition cannot be represented using  
Gloss
tdefining relationships
. There are two potential approaches to this, one would be to use a general purpose description logic language (e.g.  
Gloss
tOWL
) and the other is to use a 
Gloss
tSNOMED CT expression
 to represent each definition. The 
Concept
ShowPartsterm
t705109006 Code to expression type reference set
 is designed to support the expression-based approach.

Caption table
Code to expression type reference set - Data Structure


Field

Data type

Purpose

Gloss
tMutable
LinkTypesubtle

Part of Primary Key

id

Specref
RefType(data type)
tUUID

A 128 bit unsigned

Specref
RefType(data type)
tInteger
, uniquely identifying this
Gloss
treference set member
.

Different versions of a reference set member share the same

Specref
RefType(field)
tid
but have different
Specref
RefType(field)
teffectiveTime
. This allows a reference set member to be modified or made
Specref
RefType(field)
tactive
(i.e. removed from the active set) at a specified time.

NO

YES (Full/Snapshot) 

Specref
RefType(field)
teffectiveTime

Specref
RefType(data type)
tTime

The inclusive date or time at which this version of the identified

Gloss
Spacetrue
treference set member
became the current version.

The current version of this

Gloss
Spacetrue
treference set member
at time T is the version with the most recent
Specref
RefType(field)
teffectiveTime
prior to or equal to time T .

YES

YES (Full)

Optional (Snapshot) 

Specref
RefType(field)
tactive

Specref
RefType(data type)
tBoolean

The state of the identified

Gloss
Spacetrue
treference set member
as at the specified
Specref
RefType(field)
teffectiveTime
.

If

Specref
RefType(field)
tactive
= 1 (true) the
Gloss
Spacetrue
treference set member
is part of the current version of the set, if
Specref
RefType(field)
tactive
= 0 (false) the
Gloss
Spacetrue
treference set member
is not part of the current version of the set.

YES

NO

Specref
RefType(field)
tmoduleId

Specref
RefType(data type)
tSCTID

Identifies the

Gloss
Spacetrue
tSNOMED CT module
that contains this
Gloss
Spacetrue
treference set member
as at the specified
Specref
RefType(field)
teffectiveTime
.

The value must be a

Gloss
Spacetrue
tsubtype
of
Concept
t900000000000443000|Module (core metadata concept)|
ShowFormatinline
within the metadata
Gloss
thierarchy
.

YES

NO

Specref
RefType(field)
trefsetId

Specref
RefType(data type)
tSCTID

Identifies the

Gloss
Spacetrue
treference set
to which this
Gloss
Spacetrue
treference set member
belongs.

In this case, set to as subtype descendant of:

Concept
ShowPartsterm
t705109006 Code to expression type reference set

NONO

Specref
RefType(field)
treferencedComponentId

Specref
RefType(data type)
tSCTID

A reference to the

Gloss
Spacetrue
tSNOMED CT component
to be included in the
Gloss
treference set
.

NONO

Specref
tmapTarget

Specref
RefTypedata type
tString

The

Gloss
tother-code
t:other-codes
to/from which the concept is mapped.

NONO

Specref
texpression

Specref
RefTypedata type
tString

Gloss
tSNOMED CT expression
 that represents the SNOMED CT definition of the 
Gloss
tother-code
t:other-codes
. This expression may be a 
Gloss
tstated
GlosTermstated view
 or 
Gloss
tinferred view
 of the definition provided that documentation of each identified reference set specifies the view provided.

The expression must conform to the syntax defined in the SNOMED CT Compositional Grammar - Specification and Guide (http://snomed.org/scg).

YESNO

Specref
tdefinitionStatusId

Specref
RefTypedata type
tSCTID

Indicates whether or not the expression contains a sufficient definition of the

Gloss
tother-code
t:other-codes
in the mapTarget field.
Possible values are the following subtypes of
Concept
t900000000000444006 Definition status
:

Scg expression
    900000000000074008 |Necessary but not sufficient concept definition status|
    900000000000073002 |Sufficiently defined concept definition status|


YESNO

Specref
tcorrelationId

Specref
RefTypedata type
tSCTID

The correlation between the SNOMED CT expression and the

Gloss
tother-code
t:other-codes
. Possible values are the following subtypes of
Concept
t447247004 SNOMED CT source code to target map code correlation value
:

Scg expression
	447559001 |Broad to narrow map from SNOMED CT source code to target code|
	447557004 |Exact match map from SNOMED CT source code to target code|
	447558009 |Narrow to broad map from SNOMED CT source code to target code|
	447560006 |Partial overlap between SNOMED CT source code and target code|

When these values are applied to this reference set type, the phrase "SNOMED source code" is interpreted as meaning "SNOMED expression" and "target code" refers to the

Gloss
tother-code.
t:other-codes
.

YESNO

Specref
tcontentOriginId

Specref
RefTypedata type
tSCTID

Indication of whether the concept was initially in one of the terminologies (SNOMED CT or

Gloss
tother-codes
t:other-codes
) and added to the other as part of mapping or was in both terminologies at the outset. Values are subtypes of  
Concept
t705116007 Original code system source for linked content value
.

YESNO


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