W3C okays SMIL 2.1 Web services specs

December 21, 2005

W3C (the World Wide Web Consortium) just announced the publication of Synchronized Multimedia Integration Language (SMIL 2.1), which will help make multimedia presentations on mobile devices a reality.

SMIL (pronounced "smile") is an XML Web services application that enables simple authoring of interactive audiovisual presentations.

SMIL 2.1 has been redesigned as a series of composable modules based on the framework provided by the W3C Recommendation Modularization of XHTML.

The new features of SMIL 2.1 are the result of coordination between associations of users and the Synchronized Multimedia (SYMM) Working Group, according to a statement from the consortium.

The work builds on the experience of the 3rd Generation Partnership Project (3GPP) in deploying SMIL 2.0 on mobile devices. The SYMM Working Group has also standardized the SMIL 2.1 Mobile Profile.

SMIL 2.1 makes authoring easier and enhances transition and layout features, the consortium said. SMIL 2.1 augments the toolbox of the multimedia presentation designer, including full-screen transitions, enhanced visual layout capabilities such as background image tiling, and enhanced audio layout capabilities, including fade-in and fade-out.

The new recommendation also allows authors to predefine sets of parameters that may be referenced multiple times in a presentation, and across presentations. This reuse not only makes it easier to author and maintain content, it also reduces the size of SMIL presentations, another factor that can improve performance on mobile devices.

The SMIL 2.1 recommendation defines three new profiles:

SMIL 2.1 Language Profile
SMIL 2.1 Mobile Profile
SMIL 2.1 Extended Mobile Profile

The Mobile and Extended Mobile Profiles have been created to match the capabilities of a wide range of mobile devices, with animation and enhanced layout and timing features being the primary additions to the Extended Mobile Profile. SMIL 2.1 also explains how to define additional profiles.

Source: Web Services.org

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