code: def empty(cls, base_uri=None, draft=AUTO):
          
          return cls.from_object({}, base_uri=base_uri, draft=draft)
docs: Returns an empty ``Document``.
  
          Arguments:
  
          - ``base_uri``: optional URL used as the basis when expanding
                                 relative URLs in the document.
          - ``draft``: a ``Draft`` instance that selects the version of the spec
                       to which the document should conform. Defaults to
                       ``drafts.AUTO``.