XML Programming Resource Center: XML Schemas

Article: "Designing XML Schema Libraries," by Aaron Skonnard. Topics include type hierarchies, deriving from complex types by restriction, deriving from complex types by extension, blocking derivation, abstract types, substitution with xsi:type, substitution groups, blocking substitution, reuse and more.

W3C Schema Resources

http://www.xmlschema.com

Provides various resources for creating and validating W3C schema.

XML Authority W3C Schema and DTD Editor

http://www.extensibility.com

Home page for the XML Authority W3C Schema and DTD editor.

XML Spy 3.0 Development Environment

http://www.xmlspy.com/download.html

Download the XML Spy 3.0 development environment. A 30-day trial version is available.

Schema/DTD Repository

http://www.DTD.com

Provides a schema/DTD repository for a wide range of technologies. Provides a Web-based program named DTDFactory from which DTDs can be created, edited and saved to disk. DTDFactory allows DTD authors to submit DTDs they create to the repository. In the future, a Web-based program named SchemaFactory will be implemented for creating and editing W3C Schema.

Validation Tool

/3/Portals/0/Repository/xsdvalidator

Online tool for validating XML documents against an XML Schema.

Validating XML Schema Tool

http://www.w3.org/2001/03/webdata/xsv

Online tool for validating XML Schema documents.

XML Schema Tutorial

http://www.w3schools.com/schema/default.asp

XML Schema tutorial.

Intro to Backus-Naur Form (BNF) and EBNF

http://www.garshol.priv.no/download/text/bnf.html

Introduces Backus-Naur Form (BNF) and EBNF, and discusses the differences between these notations.