WebCGM 2.0

W3C Candidate Recommendation 06 September 2006

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Benoit Bezaire, ITEDO
David Cruikshank, The Boeing Company
Lofton Henderson

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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 and followed by a second (errata) release in 2001, 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.

WebCGM 2.0 adds a DOM (API) specification for programmatic access to WebCGM objects, and a specification of an XML Companion File (XCF) architecture, for externalization of non-graphical metadata. WebCGM 2.0, in addition, builds upon and extends the graphical and intelligent content of WebCGM 1.0, delivering functionality that was forecast for WebCGM 1.0, but was postponed in order to get the standard and its implementations to users expeditiously.

The design criteria for WebCGM aim at a balance between graphical expressive power on the one hand, and 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.

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/.

Publication as a Candidate 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.

W3C publishes a Candidate Recommendation to indicate that the document is believed to be stable and to encourage implementation by the developer community. The WebCGM Working Group expects to request that the Director advance this document to Proposed Recommendation when the following exit criteria have been met:

  1. Sufficient reports of implementation experience have been gathered to demonstrate that the WebCGM 2.0 features are implementable and are interpreted in a consistent manner. To do so, the Working Group will insure that all features in the WebCGM 2.0 specification have been implemented at least twice in an interoperable way. This defined this as :
  2. The Working Group releases a public test suite for WebCGM 2.0 along with a preliminary implementation report.

The WebCGM 2.0 test suite will add to the WebCGM 1.0 test suite at least one test case for any new feature introduced in WebCGM 2.0, covering the new DOM-related and XCF features, and the new static and "intelligence" features.

The preliminary Interoperability Implementation Report shows that most WebCGM 2.0 features are already implemented. Therefore the Candidate Recommendation period is short and will end on 06 October 2006.

The Working Group has identified the following features as "at risk". If not interoperably implemented by the end of the Candidate Recommendation period, these features will be modified as shown below, in the WebCGM Profile of the Proposed Recommendation version.

This document was developed by the WebCGM Working Group, part of the Graphics Activity. The Working Group expects to advance this Working Draft to Recommendation Status. The list of changes made since the last public Working Draft is available in Appendix D1.

This specification is based, in large part, on a work by the same name, WebCGM 2.0 an OASIS Committee Specification submitted to W3C as WebCGM 2.0 Submission. This Member Submission is related to the previous W3C work on WebCGM 1.0, and draws on experiences with that format from implementors and users over five years. This Working Draft incorporates feedback and discussion following the Submission.

Please send comments on this document to the working group's public email list public-webcgm@w3.org (public archive). Use "[CR Comment]" in the subject line of your email.

Publication as a Candidate 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