@namespace("eu.dnetlib.iis.websiteusage.schemas")
protocol IIS{
    
    import idl "DataSetWebsiteUsageSimilarities.avdl";
    
    record DataSetsWithWebsiteUsageSimilarities {
//      foreign key: DataSetReference.id ("data set" data store)
        string dataSetId;
//      foreign key: DataSetReference.id ("data set" data store)
        string otherDataSetId;
        union { null , DataSetWebsiteUsageSimilarities } similarities = null;
    }
}