code: def addInternalLink(self, link):
          '''Appends InternalLink
          
          '''
          if isinstance(link, InternalLink):
              self.internalLinks.append(link)
          else:
              raise InternalLinkError( 
                  'link Type should be InternalLink, not %s' % type(link)f addInternalLink(self, link):
          '''Appends InternalLink
          
          '''
          if isinstance(link, InternalLink):
              self.internalLinks.append(link)
          else:
              raise InternalLinkError( 
                  'link Type should be InternalLink, not %s' % type(link))
docs: Appends InternalLink