WebCGM Concepts
The Structure of a WebCGM
A WebCGM is a Version 1, 2, 3, or 4 CGM as defined in ISO/IEC 8632:1999, with some restrictions. The restrictions improve the interoperability of WebCGM, and simplify the production of WebCGM interpreter (viewer) tools.
A WebCGM, as shown in Figure 1, consists of one or more Pictures. Each picture contains CGM graphic elements, as well as (optionally) Application Structures. Application Structures define objects within each picture, which are comprised of groups of graphical primitives. These intelligent objects may

