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WebCGM & SVG Revisited

WebCGM & SVG Revisited. Lofton Henderson Dieter Weidenbrück. Revisited? . 2003 study to cut hype & provide data about… Why two W3C Recommendations for s.v.g.? Lots of claims Little real data Since then… Changes in SVG (new stuff in 1.2 WD) Better understanding of some issues

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WebCGM & SVG Revisited

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  1. WebCGM & SVG Revisited Lofton Henderson Dieter Weidenbrück

  2. Revisited? • 2003 study to cut hype & provide data about… • Why two W3C Recommendations for s.v.g.? • Lots of claims • Little real data • Since then… • Changes in SVG (new stuff in 1.2 WD) • Better understanding of some issues • Evolution of implementations • Results have been disputed

  3. Some Key Differences Found • Technical • Object linking • DOM, Event model • Animation, Styling • Encoding & File sizes (esp. raster images) • Interoperability framework

  4. 2003 Overall Conclusion • Despite vastly greater power of SVG, WebCGM actually has an edge in functionality specific to Technical Graphics. • WebCGM has edge in: • Specificity • Stability & Maturity • Reliability

  5. 2004 Results Preview • Technical differences narrowed (not gone). • WebCGM still has interoperability framework edge. • SVG is making real progress in other application sectors. • SVG for peripheral applications to core TG, e.g., training animation.

  6. Context: Technical Graphics Requirements • Complex geometry with modest graphical rqts • Precision • Text • low typographical requirements • precision • Metadata rqts – modest but very specific • Reliability • Reusability and longevity • Interoperability

  7. About the Formats • WebCGM • profile of an established ISO standard, • targeted at Web-based technical graphics • SVG • New W3C standard, • targeted at creative graphics & design, high- quality, dynamic Web pages

  8. W3C Says… • “W3C Graphics Activity Statement” • There are two different markets for vector graphics • “W3C scalable graphics requirements” • WebCGM: partial; SVG: full • In principle: they should coexist & complement

  9. Questions • Isn’t SVG much more powerful? • There are lots more than 2 SVG viewers • Do it with scripting • Raster comparison is unfair • Isn’t clear-text XML an advantage?

  10. More Questions • Isn’t CSS styling a big advantage? • You confuse formats & implementations • SVG 1.2 will fix that • Use <g> (or class) for ‘name’ linking • WebCGM is perfect but SVG is not?

  11. Updated 2004 -- graphics • Ref: tables in Big Paper • SVG 1.2 will have: • Non-scaling lines, link title & multi-link, screentip. • Out-of-line link solution (actually, 1.1) • (Text issues clarified) • (Raster capabilities clarified) • WebCGM (2.0) is getting: • Simple DOM and limited styling; • Better developed event model

  12. Interoperability framework ‘04 • The paramount consideration for TG • Measured on several axes • Extensions • Resource limits • Language flavors and profiles • Predictability of text model (==) • Completeness of implementations (**) • Test suites (==) • Maturity and stability

  13. Interoperability framework ‘04 • WebCGM update • 1st release of WebCGM product data (+ICS) • Interop problem tracking system • Incremental development of the 5 plug-ins • Minus: no summary matrix raw ICS • Minus: divergence with ATA, AECMA

  14. Interoperability framework ‘04 • SVG update • Number of plug-ins increased from 2 to 4 • More tests for 1.1 • Updated implementation status matrix • a few 1.2 tests (unpublished) • Functional completeness of implementations improving. • Minus: Validator dead?

  15. Interoperability framework ‘04 • SVG and profiles • “Responsibility of application sector” (e.g., ATA) • No Rules for Profiles for now. • Assessment: a TG profile is a MUST.

  16. Looking ahead • WebCGM outlook • WebCGM 2.0 stuff: limited DOM, events • Go live with “Interop Problem Tracking Service” • Develop roadmap • Re-sync with ATA • Resource pinch

  17. Looking ahead • SVG outlook • Finish 1.2 (2004/2005) • Continued penetration mobile, 3GPP, etc • Some talk of SVG support group/consortium • Profiles? (sort out a venue for TG profile development)

  18. Conclusions 2004 • Technical differences: • In published versions, WebCGM still has some edge over SVG • Will narrow with publication of SVG 1.2 and its product implementation • Won’t disappear completely • But it’s a second-order difference • Interoperability framework is the big difference

  19. Conclusions 2004 • Early life cycle of standards • Initial excitement & high expectations • Copious but unfocused implementation • Partial/wrong implementations too numerous • Deflation of expectations • Core group organizes and attacks problems • Interop confusion slowly mitigates • Slow improvement of usability/productivity • SVG is in first half • WebCGM is in second half

  20. All things considered… • WebCGM still has edge for TG because: • Strict profile focused on TG, versus none. • Stability of the standard itself. • Maturity of the implementations. • Support group (CGMO) focused on interoperability solutions.

  21. Q and Ahttp://www.w3.org/Graphics/svghttp://www.cgmopen.org

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