This document has been submitted to the World Wide Web Consortium (see Submission Request, W3C Staff Comment). It is intended for review and comment by W3C members. Following public demand, the "WebCGM profile" specification enters "last call". The last call period will end on November 23, 1998. Publication as a "last call" working draft 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. While we do not anticipate substantial changes, we still caution that further changes are possible. It is inappropriate to use this document as reference material or to cite it as other than "work in progress".
We explicitly invite comments on this specification. Please send them to email@example.com.
CGM (Computer Graphics Metafile) has been an ISO standard for vector and composite vector/raster picture definition since 1987. It has been a registered MIME type since 1995. CGM has a significant following in technical illustration, electronic documentation, geophysical data visualization, amongst other application areas. WebCGM is a profile for the effective application of CGM in Web electronic documents. WebCGM has been a joint effort of the CGM Open Consortium, of which a number of we submitters are active members and contributors, in collaboration with W3C staff under the W3C-LA project. It represents an important interoperability agreement amongst major users and implementors of CGM, and thereby unifies current diverse approaches to CGM utilization in Web document applications. WebCGM's clear and unambiguous conformance requirements will enhance interoperability of implementations, and it should be possible to leverage existing CGM validation tools, test suites, and the product certification testing services for application to WebCGM. While WebCGM is a binary file format and is not "stylable", nevertheless WebCGM follows published W3C requirements for a scalable graphics format where such are applicable. The design criteria for the graphical content of WebCGM aimed at a balance between graphical expressive power on the one hand, and simplicity and implementability on the other. A small but powerful set of metadata elements is standardized in WebCGM, to support the functionalities of: hyperlinking and document navigation; picture structuring and layering; and, search and query on WebCGM picture content.