Signature:

      SUBROUTINE h5oget_comment_by_name_f(loc_id, name,    &
            comment, hdferr, bufsize, lapl_id)
        IMPLICIT NONE
        INTEGER(HID_T)  , INTENT(IN)            :: loc_id
        CHARACTER(LEN=*), INTENT(IN)            :: name
        CHARACTER(LEN=*), INTENT(OUT)           :: comment
        INTEGER         , INTENT(OUT)           :: hdferr
        INTEGER(SIZE_T) , INTENT(OUT), OPTIONAL :: bufsize
        INTEGER(HID_T)  , INTENT(IN) , OPTIONAL :: lapl_id

Inputs:

      loc_id   - Identifier of a file, group, dataset, or named datatype.
      name     - Name of the object whose comment is to be retrieved,
                 specified as a path relative to loc_id.

Outputs:

      comment  - The comment.
      hdferr   - Returns 0 if successful and -1 if fails.

Optional parameters:

      bufsize  - Size of the comment buffer.