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XML Schema 2001 and Relax NG Tutorial
http://www.zvon.org/xxl/XMLSchemaTutorial/Output/index.html
Introductory tutorial on W3C XML Schema and RELAX NG at zvon.org.
XML Schema Best Practices
http://www.xfront.com/BestPracticesHomepage.html
A detailed set of best practices compiled by Roger Costello from discussions among XML Schema experts.
XML Schema FAQ
http://www.schemavalid.com/faq/xml-schema.html
Compilation of FAQs from mailing lists and other sources
XML Schema Tutorial at W3Schools
http://www.w3schools.com/schema/default.asp
Introductory tutorial on W3C XML Schema from W3Schools.
XML Schema Tutorial at xfront.com
http://www.xfront.com/xml-schema.html
Detailed XML Schema tutorial with many examples, prepared by Roger Costello. Format is Microsoft PowerPoint.