Alice.Portillo at PSS.Boeing.com
Thu Jan 28 21:53:32 GMT 1999
The CGM standard allows for what it calls "intelligent graphics". The Web Application Protocol provides a DTD fragment which you can embed in your DTD to addressing the graphic and aligning the graphic to the page much as you had with the <IMG> tag in the HTML DTD.
The WebCGM Protocol provides the way of indentifying regions within the graphic which may be of interests for further linking and addressing. This is like hotspotting and is the "intelligence" talked about. So now you can jump from the XML to view a specific graphic or portion of the graphic. Which is great when you can zoom to really small regions without loss of viewing quality. The CGM graphic itself can be used the graphic to navigate to another graphic or portion of XML text.
This is pretty much what is currently seen when using raster based graphics like gif and hotspotting to navigate from text to graphic and graphic to text. This WebCGM AP provides this same functionality for the CGM 2D vector graphic. Again the big benefit is to zoom in on fine detail without loss of detail. CGM 2D graphics is a much better method (vs raster) to make available complex diagrams and schematics. Some of these are quite large or very detailed and need the support the navigation and addressing capability this WebCGM AP provide.
Product Definition and Image Technology
The Boeing Company Phone: 425.237.3351
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> From: John Cowan[SMTP:cowan at locke.ccil.org]
> Reply To: John Cowan
> Sent: Monday, January 25, 1999 1:01 PM
> To: XML Dev
> Subject: Re: WebCGM?
> Simon St.Laurent wrote:
> > Does anyone know what WebCGM (a new W3C recommendation) is and how it
> > relates to XML? About all I can figure out is that it's a format for
> > describing graphics that has something to do with XML, but the rest isn't
> > clear at all.
> WebCGM is a profile (subset) of CGM, a binary graphics format
> that describes graphics in terms of how to draw them abstractly.
> The XML DTD is used solely to explain how some of the CGM
> objects can appear inside other objects: its relation to real
> XML is purely conceptual, but if you wrote a CGM-to-XML
> translator you could use the DTD to validate parts of the
> resulting XML.
> John Cowan http://www.ccil.org/~cowan cowan at ccil.org
> You tollerday donsk? N. You tolkatiff scowegian? Nn.
> You spigotty anglease? Nnn. You phonio saxo? Nnnn.
> Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5)
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