### 1.2 Normative references

Normative references are references to external documents or resources to which implementers of DITA must comply.

[Namespaces in XML 1.0]

T. Bray, D. Hollander, A. Layman, R. Tobin, and H. S. Thompson, editors, Namespaces in XML 1.0 (Third Edition), http://www.w3.org/TR/2009/REC-xml-names-20091208/, W3C Recommendation, 8 December 2009.

[Namespaces in XML 1.1]

T. Bray, D. Hollander, A. Layman, and R. Tobin, editors, Namespaces in XML 1.1 (Second Edition), http://www.w3.org/TR/2006/REC-xml-names11-20060816/, W3C Recommendation, 16 August 2006

[RFC 2119]

S. Bradner, Key words for use in RFCs to Indicate Requirement Levels, http://www.ietf.org/rfc/rfc2119.txt, IETF RFC 2119, March 1997.

[RFC 3986]

T. Berners-Lee, R. Fielding, and L. Masinter, Uniform Resource Identifiers (URI): Generic Syntax, http://tools.ietf.org/html/rfc3986, IETF RFC 3986, January 2005.

[XML 1.0]

T. Bray, J. Paoli, C. M. Sperberg-McQueen, E. Maler, and F. Yergeau, editors, Extensible Markup Language (XML) 1.0 (Fifth Edition), http://www.w3.org/TR/REC-xml/, W3C Recommendation, 26 November 2008.

[XML 1.1]

T. Bray, J. Paoli, C.M. Sperberg-McQueen, E. Maler, F.Yergeau, and J. Cowan, editors, Extensible Markup Language (XML) 1.1 (Second Edition),http://www.w3.org/TR/2006/REC-xml11-20060816/, W3C Recommendation, 16 August 2006, edited in place 29 September 2006.

[XSD 1.0 Structures]

H. S. Thompson, D. Beech, M. Maloney, and N. Mendelsohn, editors, XML Schema Part 1: Structures Second Edition, http://www.w3.org/TR/xmlschema-1/, W3C Recommendation, 28 October 2004.

[XSD 1.0 Datatypes]

P. V. Biron and A. Malhotra, editors, XML Schema Part 2: Datatypes Second Edition, http://www.w3.org/TR/xmlschema-2/, W3C Recommendation, 28 October 2004.

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Parent Topic: Chapter 1. Introduction

Sibling Topics:

1.1 Terminology

1.3 Non-normative references

1.4 Formatting conventions in the XHTML version of the specification