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They provide a means for defining the structure, content and semantics of XML documents. XML Schema 1.0 was approved as a W3C Recommendation on and a second edition incorporating many errata was published on 28 October 2004; see reference list for pointers.
The XML Schema Working Group, part of the XML Activity, is responsible for the W3C's work on this topic -- for details see the Working Group's charter.
W3C Members can also participate in the W3C XML Schema Interest Group, a forum for the discussion of technical issues relating to the development of XML Schema.
See also: Robin Cover's index of XML Schema materials.
XML Schema 1.1 Part 2: Datatypes and XML Schema 1.1 Part 1: Structures are available.
There is also a Test Collection aimed at determining which parts of XSD 1.1 have been implemented; several implementations are under development.
XML Schema 1.1 (in two parts) is a W3C Recommendation.
It is intended to be mostly compatible with XML Schema 1.0 and to have approximately the same scope, but also to fix bugs and make whatever improvements we can, consistent with the constraints on scope and compatibility.
Code Synthesis XSD 3.0.0 - Open-source XML Schema to C compiler Boris Kolpackov 2007-08-01 Code Synthesis XSD is an open-source, cross-platform W3C XML Schema to C data binding compiler.Compared to general-purpose validating XML processors, the XSD/e-generated code is 2-10 times faster while maintaining the lowest static and dynamic memory footprints.For example, a validating parser executable can be as small as 120KB in size. We each have our preferences, but I will provide a listing to some of the more popular editors for HTML editing, XHTML editing, Web page editing, and Web site editing.Many generate bloated and garbage markup, though, so be careful! For more tools that include markup validating, see CSS Validating Tools and Accessibility and Section 508 Software and Other Tools.