module Dm:sig
..end
class virtual node :object
..end
class virtual document :Dm_atomic.atomicAnyURI option Pervasives.ref ->
object
..end
class virtual element :Dm_atomic.atomicAnyURI option Pervasives.ref ->
object
..end
class virtual attribute :object
..end
class virtual text :object
..end
class virtual comment :object
..end
class virtual processingInstruction :object
..end