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Synchronized Multimedia Integration Language (SMIL 2.1)

W3C Proposed Recommendation 27 September 2005

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Dick Bulterman, CWI - Guido Grassel, Nokia - Jack Jansen, CWI - Antti Koivisto, Nokia - Nabil Layaïda, INRIA - Thierry Michel, W3C - Sjoerd Mullender, CWI - Daniel Zucker, Access Co., Ltd.

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This document specifies the second version of the Synchronized Multimedia Integration Language (SMIL, pronounced "smile"). SMIL 2.1 has the following design goals:

Status of this document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at

This is a W3C Proposed Recommendation (PR) of the Synchronized Multimedia Integration Language (SMIL) 2.1. Publication as a Proposed Recommendation does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.

W3C Advisory Committee Members are invited to send formal review comments to the W3C Team until 28 October 2005. Review comments should be sent to; comments sent there will be made available to members after the review period ends. People wanting their comments visible to members sooner, or to be archived publicly, can send a cc to the list or to as appropriate. The public is invited to send comments to the public mailing list, including the prefix'[SMIL21 PR]' in the subject line.
After the review the Director will announce the document's disposition. This announcement should be expected no sooner than 14 days after the end of the review.

This document is based upon the SMIL 2.1 Candidate Recommendation of 13 May 2005. This version now includes the unchanged SMIL 2.0 modules which were previously linked from the CR version. This editorial change does not introduce any technical changes. The Informative Schemas Appendix present in the CR version was removed in this current version, due to lack of resources to update the SMIL 2.0 schemas to reflect the changes introduced into SMIL 2.1. A list of changes since the SMIL 2.1 Candidate Recommendation is available.

Feedback received during that review resulted in clarifications but no major changes. The SYMM Working Group believes that this specification addresses all Candidate Recommendation issues. Evidence of interoperability between at least two implementations of this specification are documented in the Implementation Report.

The SMIL 2.1 test suite along with an implementation report are publicly released and are intended solely to be used as proof of SMIL 2.1 implementability. It is only a snapshot of the actual implementation behaviors at one moment of time, as these implementations may not be immediately available to the public. The interoperability data is not intended to be used for assessing or grading the performance of any individual implementation.

This document has been produced by the SYMM Working Group as part of the W3C Synchronized Multimedia Activity, following the procedures set out for the W3C Process. The goals of the SYMM Working Group are discussed in the SYMM Working Group Charter.

The patent policy for this document is the 5 February 2004 W3C Patent Policy. Patent disclosures relevant to this specification may be found on the SYMM Working Group's patent disclosure page.

An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) with respect to this specification should disclose the information in accordance with section 6 of the W3C Patent Policy.

The authors of this document are the SYMM Working Group members. Different parts of the document have different editors.

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