This appendix provides a quick tutorial on XML schemas, so that the reader can understand the references to them elsewhere in this tutorial. To write schemas for complex enterprises or real-world B2B apps requires a more thorough understanding of their capabilities and best practices.

The XML Schema specifications come in two parts: , Structures, at , and , Datatypes, at . For a good introduction to XML Schema, see (the XML Schema primer). A host of best practices for using XML schema in real-world apps can be found at .