code: def to_creator(self, for_modify=False):
          
          signature = {}
  
          if for_modify:
              try:
                  # we should have an ID
                  signature['id'] = self.id
              except AttributeError:
                  raise AttributeError('a modify request should specify an ID')
              # Case where we change or set a name
              if hasattr(self, 'name'):
                  signature['name'] = self.name
  
          else:
              # a new signature should have a name
              signature['name'] = self.name
  
          if self.has_content():
              # Set one, flush the other (otherwise, we let relief behind...)
              if self._contenttype == 'text/plain':
                  plain_text = self._content
                  html_text = ''
              else:
                  html_text = self._content
                  plain_text = ''
  
              content_plain = {'type': 'text/plain', '_content': plain_text}
              content_html = {'type': 'text/html', '_content': html_text}
  
              signature['content'] = [content_plain, content_html]
  
          else:
              # A creation request should have a content
              if not for_modify:
                  raise AttributeError(
                      'too little information on signature, '
                      'run setContent before')
  
          return signature
docs: Returns a dict object suitable for a 'CreateSignature'.
  
          A signature object for creation is like :
  
              <signature name="unittest">
                <content type="text/plain">My signature content</content>
              </signature>
  
          which is :
  
              {
               'name' : 'unittest',
               'content': {
                 'type': 'text/plain',
                 '_content': 'My signature content'
               }
              }
  
          Note that if the contenttype is text/plain, the content with text/html
          will be cleared by the request (for consistency).