This document is Part 1 of ISO/IEC 19776, Extensible 3D (X3D) encodings. The full title of this part of the International Standard is: Information technology — Computer graphics and image processing — Extensible (X3D) encodings — Part 1: Extensible Markup Language (XML) encoding.

Background	Clauses	Annexes
Foreword	1 Scope	A  X3D Schema
Introduction	2 Normative references	B  X3D Document Type Definition (DTD)
	3 Definitions	C  Examples
	4 Concepts	Bibliography
	5 Encoding of fields
	6 Encoding of nodes
	7 Conformance

The Foreword provides background on the standards process for X3D encodings. The Introduction describes the purpose, design criteria, and characteristics of X3D encodings. The following clauses define this part of ISO/IEC 19776:

1. Scope defines the problem area that the XML encoding of X3D addresses.
2. Normative references lists the normative standards referenced in this part of ISO/IEC 19776.
3. Definitions contains the glossary of terminology used in this part of ISO/IEC 19776.
4. Concepts describes various fundamentals of the XML encoding of X3D.
5. Encoding of fields and events specifies the XML encoding of data types used by X3D nodes.
6. Encoding of nodes specifies the XML encoding of X3D nodes.
7. Conformance describes the conformance requirements for implementations of the XML encoding.

There are several annexes included in the specification:

1. X3D Schema presents the XML Schema grammar for the X3D XML file format.
2. X3D Document Type Definition (DTD) presents the DTD grammar for the X3D XML file format.
3. Examples includes a variety of XML encoded example files.