Translations:Parser function extensions/9/en

In view of the above, it is advantageous to make an extension such that the syntax to be used in an argument does not contain the pipe character $pipe or double braces (more specifically, double closing braces $brackets ). This, in spite of the fact that a pipe character would otherwise seem a suitable symbol for, e.g., a choice or union (see, e.g., ). Allowing such codes is harmless if an alternative code is also allowed, e.g. $backslash for $pipe.