version : release date : comments
---------------------------------
 v0.1      May 1957      infant state/Assembly
 v1.0      Jan 1964      proto-stage/COBOL
 v2.0      Jun 1975      H.S./BASIC
 v3.0      Jun 1979      B.S./APL
 v3.1      Apr 1980      PDP-11 (adventure)
 v3.2      Oct 1982      TOPS-20 (chase)
 v4.0      Sep 1984      Ph.D./FORTRAN
 v4.1      Oct 1984      VMS
 v5.0      Dec 1989      NASA/C++
 v5.1      Dec 1991      Sun OS2/Unix
 v5.2      Dec 1996      Prof
 v6.0      May 1999      Python
 v6.1      May 2001      Linux
 v6.2      Aug 2004      transfered to XML format