This issue has been reported by Hans Overbeek.
ExplanationWe use dcat:landingPage in GeoDCAT-AP when a resource locator is missing a function code, and we may have more than one resource locator like this. The max cardinality of dcat:landingPage is 1 in DCAT-AP. However, the DCAT definition of dcat:landingPage does not require at most 1 landing page per dataset - see: http://www.w3.org/TR/vocab-dcat/#Property:dataset_landingpage
There's a proposal under consideration in the DCAT-AP WG to drop the max cardinality constraint - see related issue:
If this proposal will not be accepted, we have to find a way to solve this issue in GeoDCAT-AP, at least, from the implementation side.