start_get_text_element

# File lib/rss/parser.rb, line 446
    def start_get_text_element(tag_name, prefix, ns, required_uri)
      pr = Proc.new do |text, tags|
        setter = self.class.setter(required_uri, tag_name)
        if setter and @last_element.respond_to?(setter)
          if @do_validate
            getter = self.class.getter(required_uri, tag_name)
            if @last_element.__send__(getter)
              raise TooMuchTagError.new(tag_name, @last_element.tag_name)
            end
          end
          @last_element.__send__(setter, text.to_s)
        else
          if @do_validate and !@ignore_unknown_element
            raise NotExpectedTagError.new(tag_name, _ns(ns, prefix),
                                          @last_element.tag_name)
          end
        end
      end
      @proc_stack.push(pr)
    end