Many extensions will provide additional It is important that extension producers understand how reference sets and their members are created. All extensions must include new members in the
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| ShowParts | term |
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| t | 900000000000534007 |Module dependency reference set| |
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to define the modules on which the extension module(s) depend. Many extensions will also specify language or dialect preferences in a | Concept |
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| t | 900000000000506000 |Language type reference set| |
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. Some extensions may also include additional reference sets to extend the use of SNOMED CT. For example,
when defining a subset of concepts for use in a specific clinical setting
and representing and distributing this set as a reference set. But extensions include reference sets by default because module dependencies and language preferences need to be established. For these reasons, extension producers must consider the logical design of reference sets as well.can be distributed as a | Concept |
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| t | 446609009 |Simple type reference set| |
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.The following subsections present the logical design rules and considerations for reference sets and reference set members in an extension:The section contains the following topics
