Prior to creating the components or reference sets in an extension, some preliminary steps must be completed. These tasks include:
- Obtaining a namespace identifier from SNOMED International
- A namespace identifier is required to generate component identifiers (SCTIDs)
- Acquiring the appropriate tools to support the creation, management, and distrbution
of the extension
- Which tools, functionalities and services are required will depend on the content of the extension
- For more information please refer to Tooling Requirements
- Note that these tools will be used to complete the steps listed below
- Creating module(s)
- At least one module concept is required
- Components and reference sets which belong to the extension are assigned to the approriate module
- Specifying module dependencies
- These dependencies are specified using the Module Dependency Reference Set
- This informs the consumers of the extension as to which additional modules are required
to use/process the content of the extension
- Note that some of these modules will come from other editions (such as the International Edition) and possibly, other extensions
Figure 5.2-1 illustrates these key steps during the initial stage of extension creation.
Figure 5.2-1: Prerequisites to creating an extension
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