From W3C XForms Group Wiki (Public)
xforms-navindex.rnc
# -*- rnc -*-
# XForms 1.1 navindex module
#
# Copyright (C) 2009 W3C (R); (MIT, ERCIM, Keio), All Rights Reserved.
#
# Permission to use, copy, modify and distribute this RELAX NG schema
# for XForms 1.1 and its accompanying documentation for any purpose and
# without fee is hereby granted in perpetuity, provided that the above
# copyright notice and this paragraph appear in all copies. The copyright
# holders make no representation about the suitability of this RELAX NG
# schema for any purpose.
#
# It is provided "as is" without expressed or implied warranty.
# For details, please refer to the W3C software license at:
#
# http://www.w3.org/Consortium/Legal/copyright-software
xforms.UI.Common.attrib &= attribute navindex { Number.datatype }?