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Each tier requires a set percentage of language tags in the metadata. The percentage for the language criterion is calculated based on the proportion of the relevant properties from edm:ProvidedCHO that have at least one language qualified value.
The tier calculation considers dereferenced resources and Contextual Classes attached to the ProvidedCHO.
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Dereferencing, in Europeana context, refers to the action of extracting information from Linked Open Data vocabularies provided in EDM fields.
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Please note that language qualified values in Contextual Classes do count if they have been either submitted by the provider or generated by Europeana from a dereferenceable link (URI) to contextual entity found in the source data, when these are attached to the ProvidedCHO, Aggregation and WebResources.
Enabling elements
In addition to the mandatory EDM metadata elements, the Data Quality Committee (DQC) has defined a list of enabling elements which can support particular user scenarios. Including one or more of these EDM metadata elements in your metadata allows for greater information retrieval and service improvement in the Europeana website and third-party platforms that use Europeana data, such as in the research sector (e.g. CLARIN).
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For the contextual classes, we recommend the use of references (links) to multilingual and Linked Open Data (LOD) vocabularies, like Getty AAT, Wikidata or Geonames. Doing this will result in enriching your metadata by adding, for instance, the translation of terms making the item more findable for people speaking different languages. Contextual classes will be considered relevant for the tier calculation, only when all minimum required metadata elements have been included in the data.info
Note that if (links to) contextual classes are not provided in the source metadata, some may still be generated as a result of Europeana’s own semantic enrichment.
Enrichment, in Europeana context, refers to the process of adding additional information based on the terms (string values) used in certain metadata fields. The enrichment process matches those values with the same values found in LOD vocabularies.
These Europeana references to contextual metadata do not count for the tier classification, however.
Overview Metadata tier requirements
Tier | Language | Enabling elements | Contextual classes |
A | At least 25% of the metadata elements from ProvidedCHO that are relevant have at least one language qualified value | At least one metadata element from one of the ‘Discovery scenario’ groups present in the ProvidedCHO | None |
B | At least 50% of the metadata elements from ProvidedCHO that are relevant have at least one language qualified value | At least three distinct metadata elements taken from two distinct ‘Discovery scenario’ groups present in the ProvidedCHO | At least one contextual class with all minimum required elements, OR link to LOD vocabulary |
C | At least 75% of the metadata elements from ProvidedCHO that are relevant have at least one language qualified value | At least four distinct metadata elements taken from two distinct ‘Discovery scenario’ groups present in the ProvidedCHO | At least two contextual classes with all minimum required elements, OR links to LOD vocabularies |
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