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

    record DocumentToDataSet {
//      document ID, foreign key: DocumentText.id
        string documentId;
//      dataset ID, foreign key: DataSetReference.id
        string datasetId; 
//		Find more details on `confidenceLevel` constraints in eu/dnetlib/iis/README.markdown file.
        union { null , float } confidenceLevel = null;
    }
}