as of OpenSong v1.5.1
Copyright 2003-2009 Sean Lickfold.
Released under the terms of the GPL.

OpenSong Song files are standard XML files with the following layout:

<song>
 <title></title>
 <author></author>
 <copyright></copyright>
 <presentation></presentation>
 <hymn_number></hymn_number>
 <capo print="false">
 <tempo></tempo>
 <timesig></timesig>
 <ccli></ccli> 
 <theme></theme>
 <alttheme></alttheme>
 <user1></user1>
 <user2></user2>
 <user3></user3> 
 <key></key>
 <aka></aka>
 <key_line></key_line>
 <lyrics></lyrics>
 <style index="default_style">
</song>