@namespace("eu.dnetlib.iis.export.schemas")
protocol IIS{

	record Concept {
//		concept identifier	
		string id;
//		Find more details on `confidenceLevel` constraints in eu/dnetlib/iis/README.markdown file.
        union { null , float } confidenceLevel = null;
    }

    record DocumentToConceptIds {
//      document ID, foreign key: DocumentText.id
        string documentId;
		array<Concept> concepts;
    }
}