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There are different ways of representing a terminology query that can be sent to a terminology server :

  • Concept

    and

    Refset

    references: lists of Ids of

    concept

    that can be retrieved from the server.
  • Text based queries: text phrases that will be applied to

    concept

    Descriptions

    in order to retrieve results for the query.
  • Concept

    definition queries: the query provides a

    concept

    definition, and the server returns all

    concepts

    that are subsumed by, or are equivalent to the definition.
  • Expression

    retrieval: predicate terminology

    expressions

    that can be applied to all candidate

    concepts

    in the terminology to test for inclusion in the results, with filtering by hierarchy and attributes. These

    expressions

    are defined using a standard

    expression

    grammar that can be parsed and transformed in order to be evaluated against candidate

    concepts

    .
  • Query languages: a query language combines any of the previous data retrieval techniques in the same syntax, including references to

    concepts

    by Ids, by text searches, by

    refsets

    or by hierarchy and attributes.

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