WebCGM 2.1

W3C Proposed Recommendation 14 January 2010

This version:
Latest WebCGM 2.1 version:
Latest WebCGM Recommendation:
Previous version:
Benoit Bezaire, PTC, bbezaire@ptc.com
Lofton Henderson, lofton@rockynet.com

This document is also available in these non-normative formats: zip file.


Computer Graphics Metafile (CGM) is an ISO standard, defined by ISO/IEC 8632:1999, for the interchange of 2D vector and mixed vector/raster graphics. WebCGM is a profile of CGM, which adds Web linking and is optimized for Web applications in technical illustration, electronic documentation, geophysical data visualization, and similar fields. First published (1.0) in 1999, WebCGM unifies potentially diverse approaches to CGM utilization in Web document applications. It therefore represents a significant interoperability agreement amongst major users and implementers of the ISO CGM standard.

The design criteria for WebCGM aim to balance graphical expressive power on the one hand, versus simplicity and implementability on the other. A small but powerful set of standardized metadata elements supports the functionalities of hyperlinking and document navigation, picture structuring and layering, and enabling search and query of WebCGM picture content.

The present version, WebCGM 2.1, refines and completes the features of the major WebCGM 2.0 release. WebCGM 2.0 added a DOM (API) specification for programmatic access to WebCGM objects, a specification of an XML Companion File (XCF) architecture, and extended the graphical and intelligent content of WebCGM 1.0.

Status of this Document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at http://www.w3.org/TR/.

This is the Proposed Recommendation of the WebCGM 2.1 for review by W3C Members and other interested parties. It has been produced by the WebCGM Working Group, part of the Graphics Activity. The Working Group expects to advance this Working Draft to Recommendation Status.

W3C Advisory Committee Representatives are invited to submit their formal review per the instructions in the Call for Review (see Advisory Committee questionnaires). The review period ends on 11 February 2010. (Please note that an incorrect review end date of 31 January was corrected in place on 20 January.). Members of the public are also invited to send comments on this Proposed Recommendation to the public email list public-webcgm@w3.org (public archive). Use the prefix '[WebCGM 2.1 PR comment]' in the subject line of your email.

This document is based upon the WebCGM 2.1 Candidate Recommendation of 15 September 2009. Feedback received during that review resulted in clarifications and minor changes, but no major changes. The WebCGM Working Group believes that this specification addresses all Candidate Recommendation issues. The list of changes made since the Candidate Recommendation is available in Appendix D1.

A public WebCGM 2.1 implementation report. showing that the Candidate Recommendation exit criteria have been met and exceeded is available, along with a public test suite for WebCGM 2.1.

The following features as "at risk" mentioned in the WebCGM 2.1 Candidate Recommendation version for which there were not at least two implementations at the end of the Candidate Recommendation period were removed from this specification:

Apart from the above 4 features as "at risk" removed from this specification, each test in the WebCGM 2.1 Test Suite has at least two passing implementations developed independently.

Publication as a Proposed Recommendation does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

WebCGM 2.1 is related to the previous W3C work on WebCGM 1.0 and 2.0. WebCGM 2.0 was simultaneously published by W3C as a Recommendation and by OASIS as an OASIS Standard. The two versions are identical in technical content, differing only in the formatting and presentation conventions of the two organizations. It is agreed that WebCGM 2.1 will be progressed by the same collaborative process and will result in technically a identical Recommendation and OASIS Standard.

This WebCGM 2.1 specification was initially based on a work by the same name, WebCGM 2.1 an OASIS Committee Specification.

Publication as a Proposed Recommendation does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

This document was produced by a group operating under the 5 February 2004 W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

Table of Contents

Detailed Table of Contents

1.0 Introduction to WebCGM

2.0 WebCGM Concepts

3.0 WebCGM Intelligent Content

4.0 WebCGM XML Companion File (XCF)

5.0 WebCGM Document Object Model (DOM)

6.0 WebCGM Profile

7.0 Conformance

8.0 ECMAScript binding

9.0 Application Configurable Items