Datasets are created by the study, so CLOSER doesn't handle any of the data. The study can choose how to organise their datasets to be consistent with their systems and user access.
Therefore there is a many-many relationship between the dataset and the questionnaire. There can be several datasets per questionnaire, or there could be several questionnaires per dataset.
If the study is funded by the ESRC, is is a requirement that the data are deposited in the UKDS, and so the dataset metadata provided by these studies usually matches what is available at the UKDS, and the DOI for this is provided.
For studies that manage their own data access or through other platforms like DPUK, the study should provide dataset metadata which users can request and a stable URL is provided.
Since CLOSER Discovery only provides metadata, it is usually acceptable for the datasets to contain variables which are under controlled access.
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