Anchor
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_0aca28a6-c19b-4c5b-be07-92c3a9cd7524
Purpose

The

scg-expression

Concept

ShowParts

t

id+term

900000000000534007|Module

dependency

reference

set|

represents dependencies between different

Gloss

t	SNOMED CT

release

Gloss

t	modules

. In each case, the dependency indicates which targetEffectiveTime (field) of each particular

Gloss

t	module

a given sourceEffectiveTime (field) of the dependent

Gloss

t	module

requires.

Anchor
_e5f0fe86-0d58-46d8-b09c-14f66d6c8b80
_e5f0fe86-0d58-46d8-b09c-14f66d6c8b80
Data structure

The

Gloss

t	Module dependency reference set

is a String (data type) - String (data type) which is

Gloss

t	reference set

which is used to represent dependencies between

Gloss

t	modules

, taking account of

Gloss

t	module

versioning. Its structure is shown in the following table.

Table 54. Module dependency reference set - Data Structure

Field

Data type

Purpose

id (field

Anchor

_e5f0fe86-0d58-46d8-b09c-14f66d6c8b80__6

Field

Data type

Purpose

id (field)

UUID (data type)

A 128 bit unsigned Integer (data type), uniquely identifying this

Gloss

t	reference set member

.

Different versions of a reference set member share the same id (field) but have different effectiveTime (field). This allows a reference set member to be modified or made active (field) (i.e. removed from the active set) at a specified time.

effectiveTime (field)

Time (data type)

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

Gloss

t	reference set member

became the current version.

The current version of this

Gloss

t	reference set member

at time T is the version with the most recent effectiveTime (field) prior to or equal to time T .

active (field)

Boolean (data type)

The state of the identified as at the

Gloss

t	reference set member

as at the specified effectiveTime (field) .

If active (field) = 1 (true) the

Gloss

t	reference set member

is part of the current version of the set, if active (field) = 0 (false) the

Gloss

t	reference set member

is not part of the current version of the set.

moduleId (field)

SCTID (data type)

Identifies the

Gloss

t	SNOMED CT module

that contains this

Gloss

t	reference set member

as at the specified effectiveTime (field) .

The value must be a of

Scg expression

ShowParts	id+term

Gloss

t	subtype

of

Concept

t	900000000000443000\|Module

(core

metadata

concept)|

within the metadata

Gloss

t	hierarchy

.

In this

Gloss

t	reference set

, moduleId (field) also refers to the dependent source

Gloss

t	module

. Thus each

Gloss

t	module

contains the rows of the id+term

Scg expression
ShowParts

Concept

t	900000000000534007\|Module

dependency

reference

set|

that represent its dependencies on other

Gloss

t	modules

.

refsetId (field)

SCTID (data type)

Identifies the

Gloss

t	reference set

to which this

Gloss

t	reference set member

belongs.

In this case, set to

id+term

Scg expression
ShowParts

Concept

t	900000000000534007\|Module

dependency

reference

set|

referencedComponentId (field)

SCTID (data type)

The identifier of a target

Gloss

t	module

on which the dependent

Gloss

t	module

(identified by moduleId (field)) depends. Thus must be a of Scg expression

ShowParts	id+term

Gloss

t	subtype

of

Concept

t	900000000000443000\|Module

(core

metadata

concept)|

.

sourceEffectiveTime (field)

Time (data type)

The effective time of the dependent source

Gloss

t	module

(identified by moduleId (field)). This specifies a version of that

Gloss

t	module

, consisting of all

Gloss

t	components

that have the same moduleId (field) as this

Gloss

t	refset member

in their states as at the specified targetEffectiveTime (field) .

targetEffectiveTime (field)

Time (data type)

The effective time of the target

Gloss

t	module

required to satisfy the dependency (identified by referencedComponentId (field)). This specifies a version of that

Gloss

t	module

, consisting of all

Gloss

t	components

with the moduleId (field) specified by referencedComponentId (field) in their states as at the specified targetEffectiveTime (field) .

...

Module version dependencies are represented using a single

scg-expression

Concept

ShowParts

t

id+term

900000000000534007|Module

dependency

reference

set|

. Thus all module dependency rows have the same refsetId ( scg-expression

Concept

ShowParts

t

id

900000000000534007|Module

dependency

reference

set

(foundation

metadata

concept)|

).

It is the responsibility of the organization owning and maintaining a dependent module to identify all modules on which it depends. They do this by adding rows to the

id+term

Scg expression
ShowParts

Concept

t	900000000000534007\|Module

dependency

reference

set|

within the dependent module. Because these added member must be in the dependent module, the moduleId (field) of the

Gloss

t	reference set

member record is also the identifier of the dependent (source) module. The target module on which the source module depends is identified by the referencedComponentId (field) .

...

Note: Current practice assumes the refset.id column contains the same identifier for all versions of the dependencies between the same pair of modules. This approach means that at any given time only one version of each module has effective dependencies. Therefore, to review the dependencies of an earlier version, a snapshot for an earlier time must be checked. An alternative approach has been suggested by some people in which a new identifier is allocated to each dependency of each module. This would then mean that all past dependencies would be visible in a snapshot view. It would also mean that it would be possible release updated dependencies for an existing module version while also releasing more up-to-date versions of the same module with different dependencies. This added flexibility comes at the price of additional complexity and for the time-being the

Gloss

t	International Release

continues to use the simpler approach in which each new version of a dependency supersedes the dependency between earlier versions of the same pair of modules.

...

The following metadata in the "Foundation metadata " supports this

Gloss

t	concept

"

Gloss

t	hierarchy

supports this

Gloss

t	reference set

:

Anchor
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_2bd409bd-1d1d-43b0-a9d8-08068a1b3651__6
Anchor
_2bd409bd-1d1d-43b0-a9d8-08068a1b3651__5
_2bd409bd-1d1d-43b0-a9d8-08068a1b3651__5
scg-expression
Concept
ShowParts
t
id+term
900000000000454005|Foundation

metadata

concept|
Anchor
_2bd409bd-1d1d-43b0-a9d8-08068a1b3651__e
_2bd409bd-1d1d-43b0-a9d8-08068a1b3651__e
- Concept
  t
  Scg expressionShowPartsid+term
  900000000000455006|Reference
  
  set|
  Anchor
  _2bd409bd-1d1d-43b0-a9d8-08068a1b3651__8
  _2bd409bd-1d1d-43b0-a9d8-08068a1b3651__8
  - scg-expression
    Concept
    ShowParts
    t
    id+term
    900000000000534007|Module
    
    dependency|

Figure 17. Module Dependency Reference Set in the Metadata Hierarchy

Each Each component within a

Gloss

t	SNOMED CT release

references a moduleId (field). This is the

Gloss

t	module

that the component is currently mastered in (from the effectiveTime (field) held on the component record). A module is simply a collection of

Gloss

t	SNOMED CT components

that are maintained as a unit by a single organization. It is the organization 's responsibility to organize the components in each

Gloss

t	extension

that it is responsible for into one or more modules, in a way that best fits its business needs.

A module is modeled by a of

scg-expression

Gloss

ShowParts

t

id+term

descendant

of

Concept

t	900000000000443000\|Module\|

in the metadata

Gloss

t	hierarchy

. The id+term

Scg expression
ShowParts

Concept

t	900000000000443000\|Module\|

sub -

Gloss

t	hierarchy

is organized by a maintaining organization into a number of groups. For example, all modules maintained by

Gloss

t	SNOMED International

will be

Gloss

t	children

of

Scg expression

Concept

t

ShowPartsid+term

	900000000000445007\|SNOMED

International

maintained

module|

. The scg-expression

Concept

ShowParts

t

id+term

900000000000443000\|Module\|
ShowFormat	inline

Gloss

t	sub-hierarchy

models modules maintained by each organization and does NOT model module dependencies. Instead, module dependencies are modeled using the scg-expression

Concept

ShowParts

t

id+term

900000000000534007|Module

dependency

reference

set|

.

At the point of release, if any

Gloss

t	component

within a module has changed, then a new row will be added to id+term

Scg expression
ShowParts

Concept

t	900000000000534007\|Module

dependency

reference

set|

for the module's ,

Gloss

t	concept

, with the effectiveTime (field) set to the date of the new release, irrespective of whether the other fields in the module

Gloss

t	concept

record itself have changed. The updated |Module|

Gloss

t	concept

record identifies that some components within the module have been updated in this release. Where no components within a module have been updated, then a new module record will not be added and the module's effectiveTime (field) field will not change from the previous release.

Each

Gloss

t	component

will be in one, and only one

Gloss

t	component

. The module that a component is mastered in may change over time, and when this happens, the component's moduleId (field) field will be updated (in the usual way by appending a row for the component).

Each module will be in one and only one

Gloss

t	extension

. Modules will not straddle

Gloss

t	extensions

. The

Gloss

t	extension

that a module resides in is defined by the SCTID (data type) of the module. A module may not move from one

Gloss

t	extension

to another over time. If the components within a module are to be moved to another

Gloss

t	extension

, then a new module must be created within the destination

Gloss

t	extension

to host the components that are to be transferred.

There may be more than one module in an

Gloss

t	extension

.

Anchor
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_aaeb7fcf-bbe8-4966-a01f-16e4c41c153a
Descriptor

The table below shows the descriptor that defines the structure of the

id+term

Scg expression
ShowParts

Concept

t	900000000000534007\|Module

dependency

reference

set|

.

...

Scg expression

ShowParts	id+term

900000000000534007|Module dependency|

...

refsetId

...

referencedComponentId (Referenced component)

...

attributeDescription (Attribute description)

...

attributeType (Attribute type)

...

attributeOrder (Attribute order)

...

Scg expression

ShowParts	id+term

900000000000456007|Reference set descriptor|

...

Scg expression

ShowParts	id+term

900000000000534007|Module dependency|

...

Scg expression

ShowParts	id+term

900000000000535008|Dependency target|

...

Scg expression

ShowParts	id+term

900000000000461009|Concept type component|

...

0

...

Scg expression

ShowParts	id+term

900000000000456007|Reference set descriptor|

...

Scg expression

ShowParts	id+term

900000000000534007|Module dependency|

...

Scg expression

ShowParts	id+term

900000000000536009|Source effective time|

...

Scg expression

ShowParts	id+term

900000000000475002|Time|

...

1

...

Scg expression

ShowParts	id+term

900000000000456007|Reference set descriptor|

...

Scg expression

ShowParts	id+term

900000000000534007|Module dependency|

...

Scg expression

ShowParts	id+term

900000000000537000|Target effective time|

...

Scg expression

ShowParts	id+term

900000000000475002|Time|

...

2

...

refsetId

referencedComponentId (Referenced component)

attributeDescription (Attribute description)

attributeType (Attribute type)

attributeOrder (Attribute order)

Concept

t	900000000000456007\|Reference set descriptor\|

Concept

t	900000000000534007\|Module dependency\|

Concept

t	900000000000535008\|Dependency target\|

Concept

t	900000000000461009\|Concept type component\|

0

Concept

t	900000000000456007\|Reference set descriptor\|

Concept

t	900000000000534007\|Module dependency\|

Concept

t	900000000000536009\|Source effective time\|

Concept

t	900000000000475002\|Time\|

1

Concept

t	900000000000456007\|Reference set descriptor\|

Concept

t	900000000000534007\|Module dependency\|

Concept

t	900000000000537000\|Target effective time\|

Concept

t	900000000000475002\|Time\|

2

Note: The table above omits the initial four columns of data present in the release file. These follow the standards versioning pattern id (field), effectiveTime (field), active (field), active (field). Additionally, to aid understanding, the table above also shows the

Gloss

t	term

from one of the

Gloss

t	descriptions

associated with each of the identified

Gloss

t	concept

. The release file only contains the

Gloss

t	identifier

.

Anchor
_6d6f9e33-8512-41ca-a84f-e1ce5e2d480b
_6d6f9e33-8512-41ca-a84f-e1ce5e2d480b
Module dependency reference set example

The table below holds example entries for the

Concept

t	900000000000534007\|Module dependency reference set\|

in a

Gloss

t	snapshot view

of the January 2014

Gloss

t	SNOMED CT International Release

.

This

Gloss

t	SNOMED CT International Release

contains three modules: Note: The table above omits the initial four columns of data present in the release file. These follow the standards versioning pattern id (field), effectiveTime (field), active (field), active (field). Additionally, to aid understanding, the table above also shows the from one of the associated with each of the identified . The release file only contains the .

Anchor
_6d6f9e33-8512-41ca-a84f-e1ce5e2d480b__u
_6d6f9e33-8512-41ca-a84f-e1ce5e2d480b

...

The table below holds example entries for the

Scg expression

ShowParts	id+term

900000000000534007|Module dependency reference set|

in a of the January 2014 .

This contains three modules:

...

Scg expression

ShowParts	id+term

900000000000012004|SNOMED CT model component|

...

Scg expression

ShowParts	id+term

900000000000207008|SNOMED CT core|

...

Scg expression

ShowParts	id+term

900000000000012004|SNOMED CT model component|

...

Scg expression

ShowParts	id+term

449080006|SNOMED CT to ICD-10 rule-based mapping module|

...

__u
Concept
t 900000000000012004|SNOMED CT model component|
which has no dependencies;
Concept
t 900000000000207008|SNOMED CT core|
which depends on the
Concept
t 900000000000012004|SNOMED CT model component|
; and
Concept
t 449080006|SNOMED CT to ICD-10 rule-based mapping module|
which depends on both the other modules.

In this case all the 2014-01-31 modules depend on 2014-01-31 versions of the other modules. However, in some case a module may depend on an earlier version of another model (e.g. an extension module may be releases after the

Gloss

t	SNOMED CT International Release

to which it applies).

Dependencies are not transitive. The fact that

Concept

t	449080006\|SNOMED CT to ICD-10 rule-based mapping module\|

is dependent on

Concept

t	900000000000207008\|SNOMED CT core\|

may seem to imply a dependency on

Concept

t	900000000000012004\|SNOMED CT model component\|

. However, in practice all dependencies must be explicitly specified, not just immediate dependencies.

In this case all the 2014-01-31 modules depend on 2014-01-31 versions of the other modules. However, in some case a module may depend on an earlier version of another model (e.g. an extension module may be releases after the to which it applies).

Dependencies are not transitive. The fact that

Scg expression

ShowParts	id+term

449080006|SNOMED CT to ICD-10 rule-based mapping module|

is dependent on

Scg expression

ShowParts	id+term

900000000000207008|SNOMED CT core|

may seem to imply a dependency on

Scg expression

ShowParts	id+term

900000000000012004|SNOMED CT model component|

. However, in practice all dependencies must be explicitly specified, not just immediate dependencies.

Table 56. Sample content from

Anchor
_6d6f9e33-8512-41ca-a84f-e1ce5e2d480b__1	_6d6f9e33-8512-41ca-a84f-e1ce5e2d480b__1

Scg expression

ShowParts	id+term

900000000000534007|Module dependency|

.

moduleId

refsetId

referencedComponentId (Dependency target)

sourceEffectiveTime (Source effective time)

targetEffectiveTime (Target effective time)

Concept

t

Scg expressionShowPartsid+term

	900000000000207008\|SNOMED

CT

core|

Scg expressionShowPartsid+term

Concept

t	900000000000534007\|Module

dependency|

Scg expressionShowParts

Concept

t

id+term

	900000000000012004\|SNOMED

CT

model

component|

20140131

20140131scg

-expression

Concept

ShowParts

t

id+term

449080006|SNOMED

CT

to

ICD-10

rule-based

mapping

module|

scg-expression

Concept

ShowParts

t

id+term

900000000000534007|Module

dependency|

Scg expressionShowPartsid+term

Concept

t	900000000000012004\|SNOMED

CT

model

component|

20140131

20140131 Scg expressionShowPartsid+term

Concept

t	449080006\|SNOMED

CT

to

ICD-10

rule-based

mapping

module|

scg-expression

Concept

ShowParts

t

id+term

900000000000534007|Module

dependency|

scg-expression

Concept

ShowParts

t

id+term

900000000000207008|SNOMED

CT

core|

20140131

Note: The tables above omit the initial three columns of data present in the release file. These follow the standards versioning pattern id (field), effectiveTime (field), active (field). Additionally, to aid understanding, the tables above also show the

Gloss

t	term

from one of the

Gloss

t	descriptions

associated with each of the identified

Gloss

t	concept

. The release file only contains the

Gloss

t	identifier

.

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Purpose

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_e5f0fe86-0d58-46d8-b09c-14f66d6c8b80
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Descriptor

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Module dependency reference set example

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_e5f0fe86-0d58-46d8-b09c-14f66d6c8b80
_e5f0fe86-0d58-46d8-b09c-14f66d6c8b80
Data structure

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Descriptor

Anchor
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Module dependency reference set example