This document has been reviewed by W3C Members and other interested parties and has been endorsed by the Director as a W3C Recommendation.
It is a stable document and may be used as reference material.
A separate list of all such corrections is available at
XML Schema Part 1: Structures and XML Schema Part 2: Datatypes provide the complete normative description of the XML Schema language.
This primer describes the language features through numerous examples which are complemented by extensive references to the normative texts.
This section is important for understanding many of the topics that appear in the other advanced sections.
Advanced Concepts II: The International Purchase Order (§4), the second advanced section in the primer, describes mechanisms for deriving types from existing types, and for controlling these derivations.
Each major section of the primer introduces new features of the language, and describes those features in the context of concrete examples.
Basic Concepts: The Purchase Order (§2) covers the basic mechanisms of XML Schema.The examples and other explanatory material in this document are provided to help you understand XML Schema, but they may not always provide definitive answers.In such cases, you will need to refer to the XML Schema specification, and to help you do this, we provide many links pointing to the relevant parts of the specification.This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at This is a W3C Recommendation, the first part of the Second Edition of XML Schema.This document has been produced by the W3C XML Schema Working Group as part of the W3C XML Activity.