This document is ISO/IEC 19775-2:2004, Extensible 3D (X3D). The full title of this part of the International Standard is: Information technology — Computer graphics and image processing — Extensible 3D (X3D) — Part 2: Scene access interface (SAI).

Background	Clauses	Annexes
Foreword	1 Scope	A VRML scripting backwards compatibility
Introduction	2 Normative references
	3 Definitions, acronyms, and abbreviations
	4 Concepts
	5 Data type reference
	6 Services reference
	7 Conformance

The Foreword provides background on the standards process for X3D. The Introduction describes the purpose, design criteria, and characteristics of X3D. The following clauses define Part 2 of ISO/IEC 19775:

1. Scope defines the problem area that X3D addresses.
2. Normative references lists the normative standards referenced in this part of ISO/IEC 19775.
3. Definitions, acronyms, and abbreviations contains the glossary of terminology used in this part of ISO/IEC 19775.
4. Concepts describes various fundamentals of the X3D scene access interface.
5. Data type reference defines the data types used by the application programmer interfaces.
6. Services reference defines the functionality which may be accessed through the application programmer interfaces.
7. Conformance describes the conformance requirements for X3D implementations.

There are several annexes included in the specification:

1. VRML 97 scripting backwards compatibility describes the manner in which X3D Scripting can be used to provide backwards compatibility with VRML 97 scripting.