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This refers to the data collection instrument used e.g. a questionnaire. It can have a one to many relationship with the Data Collection, as each instrument can used more than once.

The table gives a approximate idea of the structure of the DDI 3.2 XML instance used (it is not exact). 

Please refer to the CLOSER GitHub page for more information. 


Fields



DescriptionRequiredDDI Documentation
Instrument



Holds information about the instrument (usually a questionnaire)

Yeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Instrument/

InstrumentName


Instrument prefixYeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Instrument/

Agency


The DDI agency identifier for the metadata e.g. uk.alspac, uk.cls.mcsYeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Instrument/

Label


Title of the instrumentYeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Instrument/

InterviewerInstruction


Question instructionNohttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Instrument/


LiteralText

Instruction textNohttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Instrument/

ControlConstruct




Holds all constructs in order they appear in the questionnaireYeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/ControlConstruct/


Sequence

Section of questionnaire which contains other control constructsYeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Sequence/



ConstructName
Section header
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/ControlConstruct/



ConstructLabel
Section header
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/ControlConstruct/


QuestionConstruct

Holds question construct label, position and interviewee Yeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionConstruct/



ConstructName

Question construct label e.g. qc_1


https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/ControlConstruct/



ConstructLabel
Question construct name e.g. 1
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/ControlConstruct/



ResponseUnit
The person answering the question
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionConstruct/



QuestionReference
Reference to the question
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionConstruct/


IfThenElse


Nohttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/IfThenElse/



ConstructName
Condition label e.g. c_q1
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/ControlConstruct/



Description
Condition text
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandCodeType/



Command


https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandCodeType/




ProgramLanguageProgram language logic is in
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandType/




CommandContentCondition logic
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandType/


LoopWhile


Nohttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Loop/



ConstructName
Loop label e.g. l_q1
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandCodeType/



Command


https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandCodeType/




ProgramLanguageProgram language logic is in
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandType/




CommandContentCondition logic
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CommandType/


StatementItem


Nohttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/StatementItem/



ConstructName
Statement label e.g. s_q1
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/StatementItem/



LiteralText
Statement text
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/StatementItem/

QuestionScheme


Contains the question itemsYesContainer for Question Types


QuestionItem

Single questionYeshttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionItem/



QuestionItemName
Question item label e.g. qi_1
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/StandardKeyValuePairType/



LiteralText
Question text
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionItem/



CodeDomain
Code list response domain
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CodeDomainType/




CodeListReferenceReference to the code list
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CodeDomainType/




ResponseCardinalityNumber of options a respondent can select
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/CodeDomainType/



NumericDomain
Numeric response domain
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/NumericDomainType/




Label Numeric response domain label
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/NumericDomainType/




NumericTypeCodeType of numeric (float or interger)
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/NumericDomainType/




NumberRangeMin and max range
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/NumericDomainType/



TextDomain
Text response domain max length
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/TextDomainType/




LabelText response domain label
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/TextDomainType/



DateTimeDomain
Date response domain
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/DateTimeRepresentationBaseType/




LabelDate response domain label
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/DateTimeRepresentationBaseType/




DateTypeCodeDate, time or duration
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/DateTimeRepresentationBaseType/


QuestionGrid

Matrix of questionsNohttps://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionGrid/



QuestionGridName
Question grid label e.g. qc_1
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionGrid/



LiteralText
Question text
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionGrid/



GridDimension
Contains the structure of the matrix and response domains
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/QuestionGrid/




CodeDomainCode lists for X and Y axis
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/GridDimensionType/




StructuredMixedGridResponseDomainContains the response domains attached to the grid
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/composite-types/GridDimensionType/

CategoryScheme



YesContainer for Categories


CategoryName

ID of category (auto-generated)
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Category/


Label

Category text
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/Category/

CodeList



YesContainer for CodeLists


Label

Code list label
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/CodeList/


Value

Code value
https://ddialliance.github.io/ddimodel-web/DDI-L-3.2/item-types/CodeList/
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