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The major advantage of the EDMqueryMethod over the other EDMmethod types lies in the EDMquerySchema construct VIEW_ENTITY. The VIEW_ENTITY construct allows for definition of complex volatile entity types. These volatile entities may be instantiated and returned to the calling EDMqueryMethod as a QueryResult table. EDMqueryMethods are implemented as QUERY_FUNCTIONS in EDMquerySchemas.
The attached EDMquerySchemas below shows how some EDMqueryMethods are implemented with EDMexpressX.