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

    record LogEntry {
		// WARNING: the records in data store conforming to this schema have to be ordered by 'timestamp' field from the oldest to the newest.   
        string timestamp;
        string action;
        union { null , string } user = null;
        union { null , string } session = null;
        union { null , string } data = null;
    }
}