code: def structure(self):
          
          opts = {'scaffold': self}
  
          # build from a zip file
          if zipfile.is_zipfile(self.source()):
              zfile = zipfile.ZipFile(self.source(), 'r')
              try:
                  contents = zfile.read('structure.xml')
                  contents = makotext.render(contents, opts)
                  zfile.close()
                  return ElementTree.fromstring(contents)
              except StandardError:
                  logger.exception('Failed to load structure.')
                  zfile.close()
                  return None
  
          else:
              try:
                  filename = os.path.join(os.path.dirname(self.source()),
                                          'structure.xml')
                  xdata = open(filename, 'r').read()
                  xdata = makotext.render(xdata, opts)
                  return ElementTree.fromstring(xdata)
              except StandardError:
                  logger.exception('Failed to load structure.')
                  return None
docs: Returns the structure for this scaffold.
          
          :return     <xml.etree.ElementTree.Element> || None