ISO/IEC 19757-4 NVDL (Namespace-based Validation Dispatching Language)

This is a home for user information related to the International Standard for document model validation of instances with multiple namespaces using different document models. NVDL is Part 4 of ISO/IEC 19757 DSDL (Document Schema Definition Languages) http://www.dsdl.org.

Specification document (from the ISO/IEC page of Freely Available Standards):

• ZIP

• http://www.jtc1sc34.org/repository/0816.htm - proposed technical corrigenda

Schemas for NVDL scripts

• Full syntax in RELAX NG
  • compact syntax (shown in Clause 6.2)
  • XML syntax (shown in Annex A)
• Simple syntax in RELAX NG
  • compact syntax (shown in Clause 6.3)
  • XML syntax (shown in Annex B)
• Full syntax in RELAX NG + NVDL
  • RELAX NG, compact syntax (NOT shown in ISO/IEC 19757-4)
  • RELAX NG, XML syntax (shown in Annex C.2)
  • NVDL (shown in Annex C.3)

Note: As shown in the proposed technical corrigenda, the xml:lang= attribute of <message> elements is made optional

Tutorials for NVDL

• Roger Costello - xFront
• JNVDL
• Dave Pawson

Sourceforge project for the development of tutorials and test suites:

• http://sourceforge.net/projects/nvdl

Public demonstrations available on the web:

• Candidate use of NVDL in Atom

  http://www.asahi-net.or.jp/~eb2m-mrt/atomextensions/atomextensions.html

• Candidate use of NVDL in the Universal Business Language (UBL)

  http://lists.oasis-open.org/archives/ubl/200602/msg00117.html

Tools

• enovdl - Mono (.NET development platform)

  http://lists.w3.org/Archives/Public/public-schemata-users/2005Oct/0001.html

• JNVDL - open-source NVDL implementation written in Java

  • http://sourceforge.net/projects/jnvdl/
  • Usage and notes: http://xmlguru.cz/2006/05/jnvdl-early-access

• oNVDL - open-source NVDL implementation based on Jing

  • http://www.oxygenxml.com/onvdl.html

• Validator.nu now exposes the NVDL functionality of oNVDL as a Web service:

  • Browser-based UI: http://validator.nu/
  • Web service docs: http://wiki.whatwg.org/wiki/Validator.nu_Web_Service_Interface
  • Blog post: http://hsivonen.iki.fi/nvdl/

Specifications utilizing NVDL

• Ecma-376 Office Open XML http://www.ecma-international.org/publications/standards/Ecma-376.htm

• W3C Internationalization Tag Set http://www.w3.org/TR/its/

• W3C SVG Tiny 1.2 http://www.w3.org/TR/SVGMobile12/

NVDL is the successor of NRL. There are some interesting use cases in James Clark's Namespace Routing Language (NRL) introduction at http://www.thaiopensource.com/relaxng/nrl.html.