code: def before_content(self):
          
          super(DotNetObjectNested, self).before_content()
          if self.names:
              (_, prefix) = self.names.pop()
              try:
                  self.env.ref_context['dn:prefixes'].append(prefix)
              except (AttributeError, KeyError):
                  self.env.ref_context['dn:prefixes'] = [prefix]
              finally:
                  self.env.ref_context['dn:prefix'] = prefix
docs: Build up prefix history for nested elements
  
          The following keys are used in :py:attr:`self.env.ref_context`:
  
              dn:prefixes
                  Stores the prefix history. With each nested element, we add the
                  prefix to a list of prefixes. When we exit that object's nesting
                  level, :py:meth:`after_content` is triggered and the prefix is
                  removed from the end of the list.
  
              dn:prefix
                  Current prefix. This should reflect the last element in the
                  prefix history