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If an extension producer makes any changes or additions within their extension, which result in modification of the transitive closure of the International Edition, they must report this to SNOMED International. This will allow the issue that necessitated the change to be assessed and where appropriate resolved in the Internation Edition. |
Examples
T he The following 3 examples illustrate the impact of adding extension concepts as leaf concepts or intermediate concepts or intermediate concepts (after classification). The impact is considered in terms of how each addition effects subsumption testing testing using an example international concept 'G'.
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Concepts added to an extension are represented in a a concept file. These These concepts are part of a module which includes the namespace identifier assigned to the extension producer by SNOMED International. Each concept also requires additional components and reference set members to be defined. At a minimum, the following components and derivatives should be created:
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The table below provides a summary of the process to follow when adding a new concept to an extension.
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| File Type | Process |
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| Concept | A new concept identifier is allocated within the extension namespace. | The attributes of the new concept are set as follows: - id is set to the new concept identifier allocated within the extension namespace
- effectiveTime is set to the date the extension will be published
- active is set to 1 to indicate that the new concept will be active at the time of publication
- moduleId is set to the conceptId of a module that is managed by the extension producer
- definitionStatusId is set to state whether the concept is primitive or fully defined
| | Description | A description of type of | Concept |
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| ShowParts | term |
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| t | 900000000000003001 |Fully specified name| |
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and at least one description of type of | Concept |
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| ShowParts | term |
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| t | 900000000000013009 |Synonym| |
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is added. For more information on creating descriptions, please refer to 5.4.3.1 Add Description in an Extension | Stated Axiom
| Authoring the concept definition involves specifying the defining properties of the concept, i.e. stating the axioms that represent necessary conditions for the meaning of the concept. For more information, see SNOMED CT Logic Profile Specification and SNOMED CT OWL Guide. | To prepare for publication, a new row representing the concept definition is added to the OWL axiom reference set. | The attributes of the reference set member representing the stated axiom are set as follows: - id is set to the new relationship identifier allocated within the extension namespace.
- effectiveTime is set to the date the extension will be published
- active is set to '1' to indicate that the new relationship will be active at the time of publication
- moduleId is set to identify a module concept from the extension
- referencedComponentId is set to the identifier generated for the new concept
- owlExpression is set to the text of the OWL expression representing the defining properties of the new concept
| | Description | Stated Relationship | At least one | relationship to a parent concept is added. Note that concepts may have more than one | 116680003 |Is a| | | 900000000000003001 |Fully specified name| |
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and at least one description of type of | | 116680003 |Is a| | relationship as SNOMED CT is polyhierarchical.Optionally, one (or more) attribute relationship is added. The principles for adding these relationships are similar to that of adding the required subtype relationship. | 900000000000013009 |Synonym| |
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is added.For more information on creating descriptions, please | Please | 4 | Relationship | for more information about adding relationships. | | Language | Refsetreference set | The new descriptions of the concept are referenced in at least one language refset to indicate language preferences. |
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