RELAX NG
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RELAX NG


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DEFINITION - RELAX NG (RELAX Next Generation) is a deliberately simple and straightforward XML markup language for metadocument data, aka schemas, developed in response to the W3C XML Schema standard. Whereas XML Schema has the reputation of being convoluted and verbose, RELAX NG is easy to learn, use, and master. Furthermore, RELAX NG offers both an XML syntax and a compact non-XML syntax, supports XML namespaces, and does not alter the information set for any XML document it processes. Like XML Schema, RELAX NG works with XML Schema Datatypes and can draw on the expressive power of that markup to create complex data types that may then be instantiated in governing documents.

RELAX NG is an OASIS development project and the subject of ISO/IEC standard 19757-2. The standard is based on an earlier version of RELAX and another schema language called TREX, both of which were developed by SGML and XML contributor James Clark.

Clark's recent work, which centers around RELAX NG, includes:

  • Jing, an Open Source validator for RELAX NG
  • DTDinst, a toolkit for converting XML DTDs into RELAX NG
  • TRANG, a Java program that translates RELAX NG documents into numerous other formats
  • An XML mode for GNU Emacs that offers incremental XML parsing and RELAX NG validation capabilities.

Learn more about XML and XML schema
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Using RELAX NG For data integration: XML Schema proving a difficult fix when it comes to data integration? Perhaps you should take a look at RELAX NG.
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Making sense of data services mashups: Data services mashups would be easy if all the data was in XML. Since it is not, Kirstan Vandersluis of XAware Inc. explains how open source tools can help convert SQL into XML.
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Chapter of the week: XML Web services: This chapter, excerpted from Core C# and .NET, takes a look at the pluses and minues of implementing and consuming Web services in a .NET environment.
Chapter of the week: Introduction to Web services technologies: This chapter, excerpted from Service-Oriented Architecture: A Field Guide to Integrating XML and Web Services, focuses on the standards that make up the Web services platform and how Web ...
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XML Security Tutorial: This XML security tutorial is a compilation of resources that review different types of XML security standards and approaches for keeping your XML Web services secure.

LAST UPDATED: 19 Dec 2007

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More resources from around the web:
- There's more information on the RELAX NG home page.
- Wikipedia has an entry about RELAX NG.
- On SearchSOA.com, Ed Tittel reports on 'RELAX NG, the XML Schema alternative.'
- Ed Tittel also explains 'Using RELAX NG for data integration.'
- The Cover Pages maintain a page about RELAX NG.





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