It contains data from a variety of information themes and organisations.
Sets of records, however structured, and not just datasets according to standard database terminology.
The resource(s) for the dataset. Here they are either: “Data” (files or feeds/streams of data records available), or “Document” (files or web pages describing datasets).
Relates to the resource and is the format that the resource is available in (can be multiple). In regards to data they could be, for example, in csv, xml, pdf format. They may represent physical files or API calls. For a document, this could be as odf, pdf, and html for example