code: def set_tag(self, name, tag_class):
          
          # Has this tag already been defined?
          if name in self._tags:
              self._log.warn('Overwriting an existing Tag class: {tag}'.format(tag=name))
  
          # Make sure the tag class adhered to the base Tag interface
          if not issubclass(tag_class, Tag):
              self._log.error('Tag class must implement the base Tag interface, please review the documentation on '
                              'defining custom tags. (Refusing to set the tag "{tag}")'.format(tag=name))
              return
  
          self._tags[name] = tag_class
docs: Define a new tag parser method
          :param name: The name of the tag
          :type  name: str
  
          :param tag_class: The Tag class, this must be a subclass of base parser.tags.Tag
          :type  tag_class: Tag