The usage note is as follows: "This property refers to a web page that provides access to the Dataset, its Distributions and/or additional information." Cardinality is 0..1.
The datasets published on the EU ODP site are not stored on the EU ODP servers, but on the data providers' servers. The EU ODP only publishes the (DCAT-AP) description of the dataset. Often data providers publish their datasets also on their own website. What is in this case the landing page?
- Page on the EU ODP with the dataset description + distribution links: http://open-data.europa.eu/en/data/dataset/nJjJNdT2YsgDCf29jY6kw
- Page on the data providers' site with the dataset description + distribution links: http://ec.europa.eu/eurostat/web/products-datasets/-/tps00060
Is is intentional that the cardinality on dataset level is 0..1? On distribution level you can have multiple access URLs, so there you could point to both sites.
This issue has been reported by Willem Van Gemert, Andrea Perego and David Read: