@view_config(renderer='templates/form.pt', name='hiddenmissing')
    @demonstrate('Hidden, Missing Widget Representing an Integer')
    def hiddenmissing(self):
        class Schema(colander.Schema):
            title = colander.SchemaNode(
                colander.String())
            number = colander.SchemaNode(
                colander.Integer(),
                widget = deform.widget.HiddenWidget(),
                missing=colander.null,
                )
        schema = Schema()
        form = deform.Form(schema, buttons=('submit',))
        return self.render_form(form)