Page History

...

...

Please note that when the above process is being applied to the authoring of new precoordinated content, then only rules with a contentType 

Concept

scg-expression

t =

<<

723593002

|All

new

precoordinated

SNOMED

CT

content| ShowFormat inline

may be used. However, when the process is applied to the validation of (both new and existing) precoordinated content, only rules with a contentType 

Concept

scg-expression

t =

<<

723594008

|All

precoordinated

SNOMED

CT

content| ShowFormat inline

may be used. Rules with a ruleStrength of 

Concept
ShowParts term t 723597001 |Mandatory concept model rule|

 should be enforced when authoring and cause an error during validation, while rules with a ruleStrength of 

Concept
ShowParts term t 723598006 |Optional concept model rule|

 should be used as a recommendation for authoring and result in a warning during validation.

...

• The 

  Concept
  ShowParts term t 723589008 |MRCM domain reference set|

   and the 

  Concept
  ShowParts term t 723604009 |MRCM attribute domain reference set|

   use domains defined in terms of a single top-level hierarchy. This enables concepts being authored to be tested for subsumption with each domain concept, using techniques that are relatively simple to implement (e.g. using a transitive closure table).

• The 

  Concept
  ShowParts term t 723592007 |MRCM attribute range reference set|

   includes a set of attribute rules that combine the domain, grouping, cardinality and range constraints into a single expression constraint, which can facilitate the efficient implementation of content validation.

• The ruleStrengthId attribute in the 

  Concept
  ShowParts term t 723604009 |MRCM attribute domain reference set|

   and the 

  Concept
  ShowParts term t 723592007 |MRCM attribute range reference set|

   allows both mandatory rules (resulting in errors) and optional rules (resulting in warnings) to be specified.

• The contentTypeId attribute in the 

  Concept
  ShowParts term t 723604009 |MRCM attribute domain reference set|

   and the 

  Concept
  ShowParts term t 723592007 |MRCM attribute range reference set|

   allows the scope of each rule to be restricted to a particular type of SNOMED CT content, including:

  • Concept
    ShowParts term t 723596005|All SNOMED CT content|

     – for rules which apply to both precoordinated and postcoordinated content;

  • Concept
    ShowParts term t 723594008|All precoordinated SNOMED CT content|

     – for rules which apply to all precoordinated content (but not to postcoordinated content);

  • Concept
    ShowParts term t 723593002|All new precoordinated SNOMED CT content|

     – for rules which apply to newly authored (i.e. stated) precoordinated content, which may not necessarily be valid for all existing content; and

  • Concept
    ShowParts term t 723595009|All postcoordinated SNOMED CT content|

     – for rules which apply to all postcoordinated content (but not to precoordinated content).

...

Please note that in the above process only rules with a contentType

Concept

scg-expression

t =

<<

723595009

|All

postcoordinated

SNOMED

CT

content|

 should be used. Rules with a ruleStrength of 

Concept
ShowParts term t 723597001 |Mandatory concept model rule|

 should be enforced when authoring and cause an error during validation, while rules with a ruleStrength of 

Concept
ShowParts term t 723598006 |Optional concept model rule|

 should be used as a recommendation for authoring and result in a warning during validation.

...

Please note that if the expression constraint or query is being applied to a substrate that includes only precoordinated content, then only the MRCM rules with a contentType

scg-expression

Concept
t =

<<

723594008

|All

precoordinated

SNOMED

CT

content| ShowFormat inline

should be used. However, if the expression constraint or query is being applied to a substrate that may include both precoordinated and postcoordinated content, then the less restrictive rules (e.g. with broader ranges) that apply where contentType

Concept

scg-expression

t =

<<

723595009

|All

postcoordinated

SNOMED

CT

content|

 may be used. Rules with a ruleStrength of 

Concept
ShowParts term t 723597001 |Mandatory concept model rule|

 should be enforced when authoring and cause an error during validation, while rules with a ruleStrength of 

Concept
ShowParts term t 723598006 |Optional concept model rule|

 should be used as a recommendation for authoring and result in a warning during validation.

...

When a new or updated rule is introduced to the MRCM, it may take a period of time before all existing content conforms to the new rule. In these situations, a content type of

scg-expression

Concept

ShowParts

t

term

723593002|All

new

precoordinated

SNOMED

CT

content|

 can be used, to ensure that all new content obeys the rule. Over time, as the old content is updated to reflect the new rule, the content type may be changed to either term

Scg expression
ShowParts

Concept
t 723594008|All

precoordinated

SNOMED

CT

content|

 or term

Scg expression
ShowParts

Concept
t 723596005|All

SNOMED

CT

content|

. This approach can be used to ensure that all new content added to SNOMED CT conforms to high quality concept model rules, even though reviewing and correcting existing content may take additional time. 

...

To support this requirement, SNOMED CT extension developers will be able to copy the international MRCM rules defined by SNOMED International into one or more extension MRCM reference sets and edit these reference sets to add new rules and restrict or extend the existing rules as required. New MRCM reference sets created for a SNOMED CT extension must be designed to ensure consistency and data integrity between editions. Please note that if no changes to the SNOMED CT concept model are required to support an extension, no additional MRCM reference sets need to be created, as the international MRCM can be reused by the extension.

The

term

Scg expression
ShowParts

Concept
t 723563008|MRCM

Module

Scope

Reference

Set|

 is designed to allow extension developers to specify which MRCM reference sets should be applied to the content in each module. The term

Scg expression
ShowParts

Concept
t 723563008|MRCM

Module

Scope

Reference

Set|

 should therefore be referred to, to determine whether an extension is reusing the international MRCM, or using a customized extension MRCM to support its content.

...