The purpose of an schema is to define and describe a class of XML documents by using schema components to constrain and document the meaning, usage and relationships of their constituent parts: datatypes, elements and their content and attributes and their values.Schemas may also provide for the specification of additional document information, such as normalization and defaulting of attribute and element values. Thus, formalism allows a useful level of constraint checking to be described and implemented for a wide spectrum of XML applications.For those in search of a step-by-step introduction to the design, the non-normative [XML Schema: Primer] is a much better starting point than this document.

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These tools provide editing, validating and advanced transformation capabilities.

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Chapter 5 discusses Schemas and Schema-validity Assessment (§5), including the overall approach to schema-validity assessment of documents, and responsibilities of schema-aware processors.

The normative appendices include a Schema for Schemas (normative) (§A) for the XML representation of schemas and References (normative) (§B).

Please refer to the errata for this document, which may include some normative corrections.

This document is also available in these non-normative formats: XML, XHTML with visible change markup, Independent copy of the schema for schema documents, and Independent copy of the DTD for schema documents. Copyright © 2004 specifies the XML Schema definition language, which offers facilities for describing the structure and constraining the contents of XML 1.0 documents, including those which exploit the XML Namespace facility.The schema language, which is itself represented in XML 1.0 and uses namespaces, substantially reconstructs and considerably extends the capabilities found in XML 1.0 document type definitions (DTDs).This specification depends on 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 1 Introduction 1.1 Purpose 1.2 Dependencies on Other Specifications 1.3 Documentation Conventions and Terminology 2 Conceptual Framework 2.1 Overview of XML Schema 2.2 XML Schema Abstract Data Model 2.3 Constraints and Validation Rules 2.4 Conformance 2.5 Names and Symbol Spaces 2.6 Schema-Related Markup in Documents Being Validated 2.7 Representation of Schemas on the World Wide Web 3 Schema Component Details 3.1 Introduction 3.2 Attribute Declarations 3.3 Element Declarations 3.4 Complex Type Definitions 3.5 Attribute Uses 3.6 Attribute Group Definitions 3.7 Model Group Definitions 3.8 Model Groups 3.9 Particles 3.10 Wildcards 3.11 Identity-constraint Definitions 3.12 Notation Declarations 3.13 Annotations 3.14 Simple Type Definitions 3.15 Schemas as a Whole 4 Schemas and Namespaces: Access and Composition 4.1 Layer 1: Summary of the Schema-validity Assessment Core 4.2 Layer 2: Schema Documents, Namespaces and Composition 4.3 Layer 3: Schema Document Access and Web-interoperability 5 Schemas and Schema-validity Assessment 5.1 Errors in Schema Construction and Structure 5.2 Assessing Schema-Validity 5.3 Missing Sub-components 5.4 Responsibilities of Schema-aware Processors A Schema for Schemas (normative) B References (normative) C Outcome Tabulations (normative) C.1 Validation Rules C.2 Contributions to the post-schema-validation infoset C.3 Schema Representation Constraints C.4 Schema Component Constraints D Required Information Set Items and Properties (normative) E Schema Components Diagram (non-normative) F Glossary (non-normative) G DTD for Schemas (non-normative) H Analysis of the Unique Particle Attribution Constraint (non-normative) I References (non-normative) J Acknowledgements (non-normative) ) of the XML Schema definition language.Chapter 2 presents a Conceptual Framework (§2) for XML Schemas, including an introduction to the nature of XML Schemas and an introduction to the XML Schema abstract data model, along with other terminology used throughout this document.Chapter 3, Schema Component Details (§3), specifies the precise semantics of each component of the abstract model, the representation of each component in XML, with reference to a DTD and XML Schema for an XML Schema document type, along with a detailed mapping between the elements and attribute vocabulary of this representation and the components and properties of the abstract model.