att1 -> 8,0
  description: some text
  preferred name: att1.txt
  all names:
    /F -> att1.txt
    /UF -> att1.txt
  all data streams:
    /F -> 8,0
    /UF -> 8,0
att2 -> 10,0
  preferred name: att2.txt
  all names:
    /F -> att2.txt
    /UF -> att2.txt
  all data streams:
    /F -> 10,0
    /UF -> 10,0
att3 -> 12,0
  preferred name: π.txt
  all names:
    /F -> att3.txt
    /UF -> π.txt
  all data streams:
    /F -> 12,0
    /UF -> 12,0
