Archive, BaseLogicalProduct, BaseRecordLayout, Category, CategoryGroup, CategoryMap, CategoryScheme, CodeMap, CodeScheme, Comparison, ComputationItem, Concept, ConceptGroup, ConceptMap, ConceptScheme, ConceptualComponent, ControlConstruct, ControlConstructScheme, DataCollection, DataElementConcept, DataRelationship, DataSet, DDIInstance, DDIProfile, GeographicLocation, GeographicLocationScheme, GeographicStructure, GeographicStructureScheme, Group, IfThenElse, Individual, Instruction, Instrument, InterviewerInstructionScheme, LocalAddedContent, LocalHoldingPackage, LogicalProduct, Loop, Methodology, MultipleQuestionItem, NCube, NCubeGroup, NCubeInstance, NCubeInstance, NCubeInstance, NCubeLogicalProduct, NCubeScheme, Organization, OrganizationScheme, PhysicalDataProduct, PhysicalInstance, PhysicalStructure, PhysicalStructureScheme, ProprietaryRecordLayout, QuestionConstruct, QuestionItem, QuestionMap, QuestionScheme, RecordLayout, RecordLayout, RecordLayout, RecordLayout, RecordLayoutScheme, RepeatUntil, RepeatWhile, ResourcePackage, Sequence, StatementItem, StudyUnit, SubGroup, SubUniverse, Universe, UniverseMap, UniverseScheme, Variable, VariableGroup, VariableMap, VariableScheme