default namespace = ""

start =
  element movie {
    element film {
      element frame {
        attribute frameNumber { xsd:integer },
        element command { text },
        element response { text },
        element command-pp { part+ },
        element response-pp { part* }
      }+
    }
  }
part =
  element part {
    attribute class { classname },
    text
  }

classname = "plain" | "comment" | "obligation" | "label"