In general, a namespace is an abstract container providing context for the items (names, or technical terms, or words) it holds and allows disambiguation of items having the same name (residing in different namespaces - compare: URL).
As a rule, names in a namespace cannot have more than one meaning, that is, two or more things cannot share the same name. A namespace is also called a context, as the valid meaning of a name can change depending on what namespace applies. Names in it can represent objects as well as concepts.
Each language is a namespace, whether it is a natural or ethnic language, a constructed language, the technical terminology of a profession, a dialect, a sociolect, or an artificial language (e.g., a programming language).
More on [ Namespace ]

Microsoft XML 3.0: Using Namespaces in Documents - Excerpt from the Microsoft Developer's Guide on using namespaces in documents and the Microsoft XML Parser (MSXML).
Meta Description: [ Microsoft XML Core Services (MSXML) allows customers who use JScript, Visual Basic Scripting Edition (VBScript), and Microsoft Visual Studio 6.0 to build high-performance XML-based applications that provide a high degree of interoperability with other applications that adhere to the XML 1.0 stand... ]
Namespaces in XML - XML namespaces provide a simple method for qualifying element and attribute names used in Extensible Markup Language documents by associating them with namespaces identified by URI references. (W3C Recommendation 14 January 1999)
Namespaces in XML (alternate explanation) - An attempt by James Clark at a less confusing alternative explanation of the mechanism described in the XML Namespaces Recommendation.
W3Schools.com: XML Namespaces - XML Namespaces provides a method to avoid element name conflicts. This page gives examples and solutions.
Meta Description: [ Free HTML XHTML CSS JavaScript DHTML XML DOM XSL XSLT RSS AJAX ASP ADO PHP SQL tutorials, references, examples for web building. ]
XML Cover Pages: Namespaces in XML - A collection of whitepapers, perspectives and history on XML namespaces, including links, references and contacts.
XML Namespace Related-resource Language (XNRL) - an HTML-based markup language designed to contain a human-readable description of an XML namespace as well as pointers to multiple resources related to that namespace. Examples of such related resources include schemas, stylesheets, human-readable documentation (beyond that contained in the XNRL package) and executable code. (Tim Bray)
XML Namespaces FAQ - Comprehensive site of questions and answers about Namespaces in XML as maintained by Ronald Bourret.
XML Namespaces: Universal Identification in XML Markup - Article taking a detailed look at XML namespaces with examples. By Pankaj Kamthan.
Meta Description: [ XML namespaces provides a method for qualifying element and attribute names used in Extensible Markup Language (XML) documents by associating them with namespaces uniquely identified by Uniform Resource Identifier (URI) references. The motivation for XML namespaces, along with their internal work... ]
XML.com: Namespace Myths Exploded - This article discusses a number of myths that have arisen around XML namespaces, examining possible sources, clarifying what the recommendation says about them, and pointing out ways to resolve the issues they raise. By Ronald Bourrett.
Meta Description: [ Published over a year ago, the Namespaces in XML recommendation may only be a small specification, but it's caused more than its fair share of confusion. Find out what the right-thinking developer should do about XML namespaces. ]
XML.com: Namespace Nuances - Questions and answers about Namespaces in XML. By John E. Simpson.
Meta Description: [ This Q&A column tackles the question of how to write DTDs for XML applications that use namespaces. ]
XML.com: Namespaces by Example - A first look at this W3C Recommendation on Namespaces in XML. By Tim Bray.
Meta Description: [ The hows and whys of XML namespaces explained by a co-author of the specification, XML.com's technical editor Tim Bray. ]
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XSL Namespace - The XSL namespace has the URI h##p://www.w3.org/1999/XSL/Format, where ## equals tt.
Zvon.org: Namespace Tutorial - Understand Namespaces in XML using these 14 examples presented here.
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