Syntax:  SET PLACEHOLDER TRAILING text_string defined_placeholder
              defined_language

  Specifies any trailing text to be associated with the placeholder.

  This command recognizes this text and erases it along with the
  placeholder.  The trailing text must not have any leading blank
  spaces or tabs because the ERASE PLACEHOLDER command always skips
  over such spaces.

  RELATED COMMANDS:

     EXTRACT PLACEHOLDER         SET PLACEHOLDER commands
     NEW PLACEHOLDER             SHOW PLACEHOLDER