W3C Data Catalog Vocabulary (DCAT) - Comments

In response to request for comments re: [1], please find below my comments


1) accuralPeriodicity property is set at Dataset level; can't we have
different distributions with different periodicity? For example a REST API
service that provides real-time data stream, and CSV distributions issued
daily/weekly/monthly? Thus, accuralPeriodicity being a property rather per
distribution than dataset? Or is it better to have multiple datasets for
this purpose? I am thinking at exchange rates as an example, but not
limited.



2) wasDerivedFrom allows to move backwards; what about moving forward? I
mean a property such as isDerivationBaseFor, so one can retrieve
derived/following datasets as well.



3) DiscoveryService - what is the distinctive feature of a DiscoveryService
compared to a DataDistributionService? From the diagram depicted in Figure
1 one can tell that it must serve at least one dataSet (servesDataset
property is 1.*). But the example in section 5.9 does not show such a
property. Is this just a small discrepancy that should be addressed in the
example? Should DiscoveryService be DataDistribution service? Should
multiplicity of 'serves' relationship between DataService and Dataset be
optional (ie 0..*)?


Best regards,

Daniel POP

West University of Timisoara, Romania


[1] https://www.w3.org/TR/vocab-dcat-2/