code: def find_doc(self, name=None, ns_uri=None, first_only=False):
          
          return self.document.find(name=name, ns_uri=ns_uri,
              first_only=first_only)
docs: Find :class:`Element` node descendants of the document containing
          this node, with optional constraints to limit the results.
  
          Delegates to :meth:`find` applied to this node's owning document.