Suppose you have a legacy database, and an entity called ViewOfBaseData that have this id. <composite-id class="ViewOfBaseDataId" name="Id" > <key-many-to-one class="LinkResult" name="Link" column="AnalysisId" lazy="proxy" /> <key-property name="AnalysisDate" type="System.DateTime" column="AnalysisDate" /> </composite-id> Now suppose you need to retrieve all object ViewOfBaseData linked to a LinkResult object with a property KeyList [...]

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