{
{   The purpose of this request is to fetch one or more attributes
{ of a segment.
{
{       MMP$FETCH_SEGMENT_ATTRIBUTES (PVA, SEG_ATTRIBUTES, STATUS)
{
{ PVA: (input) This parameter specifies the segment number.
{
{ SEG_ATTRIBUTES: (input_output) This parameter is an adaptable
{       array of segment attribute descriptors.  Prior to issuing this
{       request, the caller stores into this array the attribute keywords
{       of the attributes to be fetched.
{
{ STATUS: (output) This parameter specifies the request status.
{       The possible error codes are:
{             mme$caller_not_in_read_bracket
{             mme$segment_number_not_in_use
{             mme$segment_number_too_big
{             mme$unsupported_keyword
{
