Trip Report WWW2004
W3C and the mobil web
there were approximately 50 attendees.
what's different about mobile ?
- small displays, keypads and keys
- one or two hand operation
- limited bandwidth
- battery constraints compute power you can use
- higher expectations about reliability
- wide variety of form factors
W3C work with mobiles:
- mobile profiles for XHTML, SVG, SMIL, CSS
- new ways to interact with mobile devices
- liaisons with related standard organizations
- take advantage of existing devices
- avoid segmentation of the web (new proposed top level domain .mobi would actually lead to fragmentation of the web)
- allowing everybody to access all resources, independently of their equipment, location, environment, disabilities etc.
- help authors of web content to meet their challenges (provide the same content only once, even for completely different medias and/or devices)
see www.w3.org/2001/di/ for details.
requirements to achive device independence:
- standardized markup languages that would run on a wide range of devices such as:
- XHTML / XHTML basic / XHTML printer profile
- SVG / SVG mobile profile
- SMIL / SMIL basic
- CSS / CSS TV profile / CSS mobile profile
- authoring: seperate content and presentation using CSS
- express alternate content or resources
- express conditions for delivery, e.g.
<sel:select> <sel:when sel:expr="screen-width > 400> <img ...> <sel:when otherwise> <p>...</p> </sel:select>
pagination and navigation:
- let authors give hints for pagination and generated navigation
- information before delivery of content, such as:
- user preferences
- device characteristics
- context and environment
- standardized set of properties
- information on the available content
Composite Capability / Preference Profiles (CC/PP):
general framework for user agents to describe the device characteristics, context, user preferences / constraints.
consists of 4 elements:
- transport protocol
- processing rules
structure: CC/PP 1.0 a W3C recommendation based on RDF, now working on the other areas, such as
- presentation characteristics:
- provide a set of standardized attributes to describe presentation capabilities of the device
- consolidate earlier inconsistent attempts such as SMIL, CSS etc
- document profile:
- provide a standardized way to describe content characteristics
question from the floor: will CC/PP adapted to reflect the latest version of RDF ?
answer: with the next review of CC/PP
question from the floor: will CC/PP be modular enough so that it can handle hardware extensions.
answer: CC/PP is flexible enough to handle HW changes.
question from the floor: what is the collaboration between the device independence working group (DI-WG) and the web accessibility initiative working group (WAI-WG) ?
answer: we are working together, join each others meetings etc
see www.w3.org/Mobile/CCPP/ for details.
what is SVG ?
- a rendering model
- an API for graphics
- XML markup
- plus an animation engine
about the rendering model:
- model for drawing onto a 2D surface
- surface could be a screen, printer or something else
- device indpendent: make as few assumption about the hardware as possible
about rendering graphics:
- infinite bendable canvas
- model enables rendering of most web and W3C presentation formats
- has an event interface
- two profiles: tiny and basic
- SVG Mobile 1.1 became a W3C recommendation in january 2003
- usefull for messages, animations, presentations, but not (yet) for games
- V1.2 tiny will be comming soon and add scripting (for games), opacity, gradients
new features with SVG 1.2:
- working with JCP on a better DOM
- XBL mapping between user specific markup and SVG
- SVG print as a complement to XHTML print and XSL:FO
- new graphics features:
- flow of graphics and text
- support for audio and video
- more SMIL
- multiple pages/scenes
- vector effects
- new interaction features:
- editable text fields
- multiple links
- rendering hints
- new APIs:
- helper functions
- network interface
- file upload
- download progress
- XML parsing
- client-side storing
see www.w3.org/Graphics/SVG/ for details.
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