Found here are the standards specific to the Extensible Markup Language or XML which is a language for the encoding of structured data for publication on the Web. You may also want to see XML Applications which covers the standards for spin off languages based on XML such as Wireless Markup Language (WML) and Simple API for XML (SAX).
Annotated XML Specification by Tim Bray - Provided by Tim Bray, co-edited the XML 1.0, this site presents an annotated specification for the Extensible Markup Language (XML) 1.0, W3C Recommendation 10-February-1998.
Canonical XML - Any XML document is part of a set of XML documents that are logically equivalent within an application context, but which vary in physical representation based on syntactic changes permitted by XML 1.0 [XML] and Namespaces in XML [Names]. This specification describes a method for generating a physical representation, the canonical form, of an XML document that accounts for the permissible changes.
Extensible Markup Language (XML) 1.0 (Fourth Edition) - The Extensible Markup Language (XML) is a subset of SGML that is completely described in this document. Its goal is to enable generic SGML to be served, received, and processed on the Web in the way that is now possible with HTML. XML has been designed for ease of implementation and for interoperability with both SGML and HTML.
International Digital Enterprise Alliance - IDEAlliance is a not-for-profit membership organization in information technology and publishing since 1966. IDEAlliance members represent a convergence of brand owners, agencies, publishers, printers, materials suppliers and solution providers. IDEAlliance provides a user-driven, cross-industry, and open environment in which its members can strategize, innovate, standardize, and implement solutions to real business challenges in eMedia-based publishing.
Knowledge Interchange Format - Knowledge Interchange Format (KIF) is a computer-oriented language for the interchange of knowledge among disparate programs. It has declarative semantics (i.e. the meaning of expressions in the representation can be understood without appeal to an interpreter for manipulating those expressions); it is logically comprehensive (i.e. it provides for the expression of arbitrary sentences in the first-order predicate calculus); it provides for the representation of knowledge about the representation of knowledge; it provides for the representation of nonmonotonic reasoning rules; and it provides for the definition of objects, functions, and relations.
SOAP - Simple Object Access Protocol - SOAP is an XML based object protocol for the exchange of information in a decentralized, distributed environment. It consists of: an envelope that defines a framework for describing what is in a message and how to process it, a set of encoding rules for expressing instances of application-defined datatypes, and a convention for representing remote procedure calls and responses. All encoding is in XML.
The XML Cover Pages from OASIS - The Cover Pages is a comprehensive, online reference collection supporting the XML family of markup language standards, XML vocabularies, and related structured information standards. Edited by Robin Cover since 1986, this public access knowledgebase promotes and enables the use of open, interoperable, standards-based solutions which protect digital information and enhance the quality of data processing.
VoiceXML Forum - The VoiceXML Forum is an industry organization founded by AT&T, IBM, Lucent and Motorola, and chartered with establishing and promoting the Voice eXtensible Markup Language (VoiceXML), a new standard essential to making Internet content and information accessible via voice and phone.
W3C Extensible Markup Language (XML) - This site is provided by the W3C (Worldwide Web Consortium) and provides the technical specifications for the Extensible Markup Language (XML). XML is a very flexible text format derived from SGML that allows information and services to be encoded with meaningful structure and semantics.
XML Developer Center - XML has become the almost universally supported way of exchanging documents and data across applications and platforms. Microsoft was a pioneer in XML development and takes pride in the quality, performance, and standards conformance of our XML technologies. We have a family of XML technologies that allows users with differing requirements to do what they need to do, as simply and efficiently as possible.
XML.Gov - This website facilitates the efficient and effective use of XML through cooperative efforts among government agencies, including partnerships with commercial and industrial organizations. XML.Gov has released a specification for exchanging objects between agencies. The website includes links to Working Groups (including a list of registered efforts), Standards & Guidelines, Registries/Repositories, Discussion Groups, and Tutorials.