PropertyEvent(Session ssn, OID oid, Property prop, Object arg) { super(ssn, oid);
PropertyEvent(Session ssn, Object obj, Property prop, Object arg) { super(ssn, obj);
    PropertyEvent(Session ssn, OID oid, Property prop, Object arg) {        super(ssn, oid);        m_prop = prop;        m_arg = arg;        m_pdata = ssn.getPropertyData(oid, prop);        log();    }