code: def find(self, name=None, ns_uri=None, first_only=False):
          
          if name is None:
              name = '*'  # Match all element names
          if ns_uri is None:
              ns_uri = '*'  # Match all namespaces
          impl_nodelist = self.adapter.find_node_elements(
              self.impl_node, name=name, ns_uri=ns_uri)
          if first_only:
              if impl_nodelist:
                  return self.adapter.wrap_node(
                      impl_nodelist[0], self.adapter.impl_document, self.adapter)
              else:
                  return None
          return self._convert_nodelist(impl_nodelist)
docs: Find :class:`Element` node descendants of this node, with optional
          constraints to limit the results.
  
          :param name: limit results to elements with this name.
              If *None* or ``'*'`` all element names are matched.
          :type name: string or None
          :param ns_uri: limit results to elements within this namespace URI.
              If *None* all elements are matched, regardless of namespace.
          :type ns_uri: string or None
          :param bool first_only: if *True* only return the first result node
              or *None* if there is no matching node.
  
          :returns: a list of :class:`Element` nodes matching any given
              constraints, or a single node if ``first_only=True``.