def implany(self):
        """
        Set the type to <xsd:any/> when implicit.

        An element has an implicit <xsd:any/> type when it has no body and no
        explicitly defined type.

        @return: self
        @rtype: L{Element}

        """
        if self.type is None and self.ref is None and self.root.isempty():
            self.type = self.anytype()