I often run across 'descendancy charts' --- as plain ASCII text. Mostly of the form:
DECENDENTS OF JOSEPH WILLIAM SMYTHE 1 SMYTHE, Joseph William b: 18 Feb 1858 in LA d: 26 Jan 1947 in Cecil, LA +LESLIE, Mary Ann Tetheny b: 22 Feb 1858 in GA d: 3 Jan 1931 in Cecil, LA 2 SMYTHE, William Joseph b: 4 Aug 1878 d: 19 Apr 1973 +WILLIAMS, Vanna 2 SMYTHE, Mary Ellen "Molley" b: 11 Sep 1884 in Cecil, Union Parish, La d: 22 Dec 1952 in El Dorado, Union Co., AR +PLANER, William Lawrence b: 16 Nov 1877 in Union Parish, LA d: 12 May 1969 in El Dorado, Union Co., AR m: 1902 3  PLANER, Ora Ezelle b: 22 Aug 1902 +SMYTHESON, Elmer d: in El Dorado, Union Co., AR m: 1921 4 SMYTHESON, Maurice b: 5 Nov 1923 4 SMYTHESON, Robert Fulton b: 16 May 1929 +JEFFERSON, Lenora Sue 5 SMYTHESON, Terry Lane b: 29 Jul 1956 d: Abt. 1990 in Fayetteville, AR 5 SMYTHESON, David b: 29 Jun 1959 *2nd Husband of  PLANER, Ora Ezelle: +SULLIVAN, Burton d: 29 Dec 1973 m: 1953
Much of which is self explanatory.
That said I'd like to know is there a standard (probably many at a guess) and could someone provide links or pointers for this subject? The use of [n] prefixing a name is not clear to me. And I am reasonably sure there are other forms of 'shorthand' possible. I'm thinking of not only producing this by hand (with suitable editor macros) but adding it to the output possibilities of my GEDCOM library.