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To define the current core metadata schema, we considered existing metadata from the COVID-19 national portal, provided metadata schema from Health-RI nodes (e.g. ABC metadata) and standards used in portals in Europe and abroad (e.g. W3C, DCAT, DCAT-AP). We then initiated mapping their classes and properties with the help of metadata specialists from the hub and nodes. The mappings are described and open for comments in the mapping table. Finally, after conceptualisation, we decided to re-use of dcat and dcat-ap for its implementation. This is mainly because dcat application profile was covering the collected requirements.

Overview

An overview of the Metadata schema core is shown by the UML diagram below (Fig 1). The UML illustrates the main classes (entities) and does not show the detailed definitions such as rdfs:label rdfs:comment. Each block represents a class, and it contains a list of attributes of such class (properties). If a class is connected to another class by a closed arrow, it means that it inherits all properties from the other class (e.g. dcat:DatasetSeries inherits from dcat:Dataset which inherits from dcat:Resource). The other arrows, represent relations and contain the type of relation (e.g. dcat:Dataset is connect to a dcat:DatasetSeries via the predicate dcat:inSeries) and the cardinality (e.g. dcat:Dataset can be connected via dcat:inSeries to zero or more dcat:DatasetSeries).

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