Metadata Tier C (Europeana website as a knowledge platform)
To offer users the best possible experience when working with your collections online, at least 75% of your metadata elements that are relevant need to have at least 1 language tag. The metadata should include at least three distinct enabling elements covering at least two distinct discovery and user scenarios and two distinct contextual classes with all minimum required elements or links to LOD vocabularies (also with all minimum required elements).
Contextual resource referred by the ProvidedCHO: A contextual entity (an instance of a contextual class such as edm:Agent, skos:Concept, edm:Place, edm:TimeSpan) that is linked directly from edm:ProvidedCHO (ie. Provider's ore:Proxy) and therefore ignoring contextual resources that are only linked from other contextual resources via e.g. placeOfBirth.
Minimum required metadata elements per contextual class