def isnil(self):
        """
        Get whether the element is I{nil} as defined by having an
        I{xsi:nil="true"} attribute.

        @return: True if I{nil}, else False
        @rtype: boolean

        """
        nilattr = self.getAttribute("nil", ns=Namespace.xsins)
        return nilattr is not None and (nilattr.getValue().lower() == "true")
Get whether the element is I{nil} as defined by having an
        I{xsi:nil="true"} attribute.

        @return: True if I{nil}, else False
        @rtype: boolean