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| Fields | Description | Required | Repeatable | |||||
|---|---|---|---|---|---|---|---|---|
| Instrument | Holds information about the instrument (usually a questionnaire) | Yes | Yes | |||||
| Agency | The DDI agency identifier for the metadata e.g. uk.alspac, uk.cls.mcs | Yes | No | |||||
| InstrumentName | Title of the instrument | Yes | No | |||||
| Version | Yes | No | ControlConstruct | Yes | No | |||
| Sequence | Yes | Yes | ||||||
| QuestionConstruct | Yes | No | ||||||
| IfThenElse | No | No | ||||||
| Loop | No | No | ||||||
| StatementItem | No | No | ||||||
| Version | Yes | No |