Timeline

PlotData =

 color:red fontsize:S                               # set defaults
 bar:USSR from:1919 till:1922 text:Lenin            # red bar
 bar:USSR from:1922 till:1953 text:Stalin           # red bar
 bar:USSR from:1939 till:1945 text:WWII color:green # green bar
 bar:USSR from:1953 till:1964 text:Krushchev        # red bar
  
 color:blue                                         # change default color
 bar:US from:1913 till:1921 text:Wilson             # blue bar
 bar:US from:1917 till:1918 text:WWI color:green    # green bar
 bar:US from:1921 till:1923 text:Harding            # blue bar

1. > this multiline comment does not end command PlotData,

  even when the previous line does not start with a space<#

  bar:US from:1923 till:1929 text:Coolidge           # blue bar

TextData = # now PlotData is considered complete

  tabs:...etc