Create a new XPointer context

def xpointerNewContext(self, here, origin):
        """Create a new XPointer context """
        if here is None: here__o = None
        else: here__o = here._o
        if origin is None: origin__o = None
        else: origin__o = origin._o
        ret = libxml2mod.xmlXPtrNewContext(self._o, here__o, origin__o)
        if ret is None:raise treeError('xmlXPtrNewContext() failed')
        __tmp = xpathContext(_obj=ret)
        return __tmp