VMS Help PASCAL, Declaration Section, Routine Declaration, formal_parameter_list, conformant_parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  A conformant parameter is a syntax of a conformant  array  or  a
  conformant VARYING parameter that represents a set of types that
  are  identical  except  for  their  bounds.   The  bounds  of  a
  conformant  parameter  are  determined each time a corresponding
  actual parameter is passed.  The bounds of an  actual  parameter
  are available within the routine through identifiers declared in
  the schema.  A conformant parameter can  only  appear  within  a
  formal parameter list.

  The form of a conformant array parameter is as follows:

    ARRAY [{lower-bound-id .. upper-bound-id :
          [[attribute-list]] index-type-id};...]
          OF [[attribute-list]] {type-id | conformant-parameter-syntax}

    PACKED ARRAY [lower-bound-id .. upper-bound-id :
          [[attribute-list]] index-type-id]
          OF [[attribute-list]] type-id

  The form of a conformant VARYING parameter is as follows:

     VARYING [upper-bound-id] OF [[attribute-list]] CHAR

  The 'lower-bound-id' is an identifier that represents the  lower
  bound of the conformant array's index.

  The 'upper-bound-id' is an identifier that represents the  upper
  bound of the conformant array's index.

  The 'attribute-list' is one or more  optional  identifiers  that
  provide additional information about the conformant array.

  The 'index-type-id' is the type identifier of the  index,  which
  must denote an ordinal type.

  The 'type-id' is the type identifier of  the  array  components,
  which can denote any type.