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The XML Schema language is a complex maze of constructs that overlap each other. Creating an XML schema is hard to get right; creating several interlocking schemas which can be extended and versioned is even harder. This document provides you with a map that allows you to navigate the maze with confidence. This document consists of the following: • An overview of the common requirements that are important for all schemas • A list of best practices for designing, writing, and coding to XML Schema There is also an appendix that discusses the rationale behind these best practices.

The design and specification of XML schemas should be as rigorous an activity as designing and developing code or designing database schemas. As such, when creating an XML schema you should be working within a development process and working to a set of design guidelines and coding standards (when writing the XML schema file). XML schemas should be reviewed for accuracy and compliance with guidelines and standards. Each of the requirements in the list below is a general requirement for all XML schemas that are intended to be used in a deployed system.