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It is important that extension producers understand how reference sets and their members are created. All extensions must include new members in the  | Module dependency reference set|  to define the modules on which the extension module(s) depend. Many extensions will also specify language or dialect preferences in a  900000000000506000 | Language type reference set| . Some extensions may also include additional reference sets to extend the use of SNOMED CT. For example, a subset of concepts for use in a specific clinical setting can be distributed as a  | Simple type reference set| .

The following subsections present the logical design rules and considerations for reference sets and reference set members in an extension:

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