Requests have been made for the possibility to group Datasets together that have common characteristics, for example containing the same kind of data for different time periods (e.g. annual statistics) or geographical coverage (e.g. statistics per region).
It should be noted that DCAT proper does not consider any type of relationships between Datasets. As it is our intention to avoid as much as possible creating new model elements or new properties that would not be understandable for implementers of the more general DCAT specification, a proposal could be to use existing classes and only add dct:hasPart and dct:isPartOf relationships, as follows:
- create description for a Dataset that acts as the 'master', e.g. "Annual statistics for temperature"
- create descriptions for the constituent Datasets, e.g. "Annual statistics for temperature in 2014", "Annual statistics for temperature in 2013" etc.
- link from the 'master' to the specific year using dct:hasPart
- link from the specific year to the 'master' using dct:isPartOf
Alternative approaches are welcome, but a main consideration should be whether this approach or any alternatives are based on existing data and not on theoretical use cases.