m_pdata = ssn.getPropertyData(oid, prop);
m_pdata = ssn.getPropertyData(obj, prop);
    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();    }