code: def process(self, body):
          
          self.nodes = []
          self.catalog = {}
          self.build_catalog(body)
          self.update(body)
          body.children = self.nodes
          return body
docs: Process the specified soap envelope body and replace I{multiref} node
          references with the contents of the referenced node.
          @param body: A soap envelope body node.
          @type body: L{Element}
          @return: The processed I{body}
          @rtype: L{Element}