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XML validation

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Title: XML validation  
Author: World Heritage Encyclopedia
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Subject: XML, Simple API for XML, Reference desk/Archives/Computing/2007 October 2
Publisher: World Heritage Encyclopedia

XML validation

XML validation is the process of checking a document written in XML (eXtensible Markup Language) to confirm that it is both well-formed and also "valid" in that it follows a defined structure. A well-formed document follows the basic syntactic rules of XML, which are the same for all XML documents.[1] A valid document also respects the rules dictated by a particular DTD or XML schema, according to the application-specific choices for those particular .[2]

In addition, extended tools are available such as OASIS CAM standard specification that provide contextual validation of content and structure that is more flexible than basic schema validations.

xmllint is a command line XML tool that can perform XML validation. It can be found in UNIX / Linux environments. An example with the use of this program for validation of a file called example.xml is

xmllint --valid --noout example.xml


  1. ^ "Well-Formed XML Documents". Extensible Markup Language (XML) 1.1.  
  2. ^ "Constraints and Validation Rules". XML Schema Part 1: Structures Second Edition.  

External links

XML toolkit
  • The XML C parser and toolkit of Gnome – libxml includes xmllint
Online validators for XML files
  • Leading XML Validation Service
Articles discussing XML validation
  • DEVX March, 2009 - Taking XML Validation to the Next Level: Introducing CAM
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