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

    import idl "PersonWebsiteUsageSimilarities.avdl";

    record PersonsWithWebsiteUsageSimilarities {
//      foreign key: Person.id ("person" data store)
        string personId;
//      foreign key: Person.id ("person" data store)
        string otherPersonId;
        union { null , PersonWebsiteUsageSimilarities } similarities = null;
    }
    
}