Syntax:  SET LANGUAGE QUOTES character_string defined_language

  Describes the syntax of certain language elements, such as strings,
  that require special handling for proper text formatting.

  LSE uses this command to detect comments properly.  LSE does not
  recognize comment strings that occur within quoted items, nor does it
  recognize quoted elements that occur within comments.

  The value must be a string denoting all of the quote characters in
  the language.  LSE assumses that quoted items begin and end with the
  same character.