docs: def serialize(self, elt, sw, pyobj, name=None, orig=None, **kw):
          '''Handles the start and end tags, and attributes.  callout
          to get_formatted_content to get the textNode value.
          Parameters:
              elt -- ElementProxy/DOM element 
              sw -- SoapWriter instance
              pyobj -- processed content
              
          KeyWord Parameters:
              name -- substitute name, (nspname,name) or name
              orig --
              
          '''
          objid = _get_idstr(pyobj)
          ns,n = self.get_name(name, objid)
  
          # nillable
          el = elt.createAppendElement(ns, n)
          if self.nillable is True and pyobj is Nilled:
              self.serialize_as_nil(el)
              return None
  
          # other attributes
          self.set_attributes(el, pyobj)
  
          # soap href attribute
          unique = self.unique or kw.get('unique', False)
          if unique is False and sw.Known(orig or pyobj):
              self.set_attribute_href(el, objid)
              return None
  
          # xsi:type attribute 
          if kw.get('typed', self.typed) is True:
              self.set_attribute_xsi_type(el, **kw)
  
          # soap id attribute
          if self.unique is False:
              self.set_attribute_id(el, objid)
  
          #Content, <empty tag/>c
          self.serialize_text_node(el, sw, pyobj)
  
          return el