lx |lexicon.lex
idx |lexicon.idx
texts :
  :
    id |1
    ty |story
    ti |Eine kleine Geschichte
    ch |2 3
  :
    id |2
    ty |page
    ti |p1
    fn |2.txt
  :
    id |3
    ty |page
    ti |p2
    fn |3.txt
    audio |3.wav
