code: def newDocTextLen(self, content, len):
          
          ret = libxml2mod.xmlNewDocTextLen(self._o, content, len)
          if ret is None:raise treeError('xmlNewDocTextLen() failed')
          __tmp = xmlNode(_obj=ret)
          return __tmp
docs: Creation of a new text node with an extra content length
             parameter. The text node pertain to a given document.