* in a form which can be used to construct an entire derived xline,
* even if it is stored differently internally (e.g. GLine stores the
* ident and host parts seperately but will still return ident\@host
* in a form which can be used to construct an entire derived xline,
* even if it is stored differently internally (e.g. GLine stores the
* ident and host parts seperately but will still return ident\@host