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

    import idl "DocumentClusters.avdl";

    record DocumentToDocumentClusters {
//      foreign key: Document.id ("document" data store)
        string documentId;
//      Information about the clusters given document belongs to
//      There might be many parallel clusterings given document belongs to.
        union { null , DocumentClusters } clusters = null;
    }
}