TMS requires that each dictionary definition have at least one level to contain dictionary terms. Dictionaries with this characteristic are called dynamic. In fact, all of the terms (1 through 6) are on the same level, and the length of the hierarchical chain is unlimited. In the above example, the number of terms that can be linked in a hierarchical chain is not limited by the number of levels. For example, you can use the named relation Narrower term to link the terms "aspirin" and "pain reliever," or the named relation Is part of to define a hierarchical series of relations as follows: Named relations describe the connection between terms. The hierarchical structure of the dictionary is defined by the relationships permitted and used in the dictionary. For example, a strong dictionary with four levels from the coding level to the highest derivation level will only have four terms in a hierarchical chain:Ī weak dictionary does not depend on dictionary levels to identify the hierarchy. Where strong dictionaries have fixed hierarchies, represented by levels, weak dictionary have dynamic hierarchies, which are variable. TMS supports these with weak dictionaries and named relations between terms. ![]() ![]() Some external dictionaries, such as SNOMED, require a different type of structure, one that is dynamically created by relations between terms.
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