{
{   The purpose  of this request is to scan and evaluate an expression that is
{ part of some larger syntactic construct.
{
{       CLP$EXPRESSION_SCANNER (TEXT, INDEX, VALUE_KIND_SPECIFIER, VALUE,
{         TOKEN, TOKEN_STATUS, STATUS)
{
{ TEXT: (input) This parameter specifies the text to be scanned.
{
{ INDEX: (input, output) This parameter specifies the  next  character  within
{       TEXT to be scanned.
{
{ VALUE_KIND_SPECIFIER: (input) This parameter specifies the value kind of the
{       result of the expression.
{
{ VALUE: (output) This parameter specifies the result of the expression.
{
{ TOKEN: (input, output) On input, this parameter specifies the first token of
{       the  expression.   On  output,  it  specifies  the  token  immediately
{       following the expression.
{
{ TOKEN_STATUS: (input) This parameter specifies whether the  first  token  of
{       the   expression   was   successfully   scanned.    This   permits  an
{       APPLICATION_KIND value to be composed of non-SCL tokens.
{
{ STATUS: (output) This parameter specifies the request status.
{
