Guidelines for defining an implicit unordered group that is delimited

  • The type of a component cannot be a binary item whose length is not fixed.
  • The type of a component must be content-distinguishable from the type of each other component.
  • If the type of a component has both an initiator and terminator, the nested delimiters do not have restrictions. If this is not the case, all contained delimiters must be different.