In this example, the extension includes new clinical content. Because all active concepts in an extension must be subsumed by the root concept, |SNOMED CT Concept|, there must exist at least one
|t||116680003 |is a||
in the extension with a destinationId
that refers to a concept in another module. Clinical content in the extension module must depend on the international core module either directly or indirectly. illustrates another example in which a content dependency results in a module dependency.