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455 lines
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
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<title>Media Fragments Working Group</title>
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<link rel="stylesheet" href="http://www.w3.org/2005/10/w3cdoc.css"
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type="text/css" media="screen" />
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<link rel="stylesheet" type="text/css"
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href="http://www.w3.org/Guide/pubrules-style.css" />
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<link rel="stylesheet" type="text/css"
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href="http://www.w3.org/2006/02/charter-style.css" />
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</head>
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<body>
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<div id="template">
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<ul id="navbar" style="font-size: small">
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<li><a href="#scope">Scope</a> </li>
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<li><a href="#deliverables">Deliverables</a> </li>
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<li><a href="#coordination">Dependencies and Liaisons</a> </li>
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<li><a href="#participation">Participation</a> </li>
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<li><a href="#communication">Communication</a> </li>
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<li><a href="#decisions">Decision Policy</a> </li>
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<li><a href="#patentpolicy">Patent Policy</a> </li>
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<li><a href="#about">About this Charter</a> </li>
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</ul>
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<p><a href="http://www.w3.org/" shape="rect"><img alt="W3C" height="48"
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src="http://www.w3.org/Icons/w3c_home" width="72" /> </a> <a class="domainlogo"
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href="http://www.w3.org/Interaction/" shape="rect"><img
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src="http://www.w3.org/Icons/interaction" alt="Interaction Domain" /> </a> </p>
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<h1 id="title">Media Fragments Working Group Charter</h1>
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<p class="mission">The <strong>mission</strong> of the <a
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href="/2008/WebVideo/Fragments/">Media Fragments Working Group</a>, part of the
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Video in the Web Activity, is to address temporal and spatial media fragments
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in the Web using Uniform Resource Identifiers (URI).</p>
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<div class="noprint">
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<p class="join"><a href="http://www.w3.org/2004/01/pp-impl/42785/join">Join the
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Media Fragments Working Group</a>.</p>
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</div>
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<table class="summary-table">
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<tbody>
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<tr id="Duration">
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<th rowspan="1" colspan="1">End date</th>
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<td rowspan="1" colspan="1">31 January 2011</td>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Confidentiality</th>
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<td rowspan="1" colspan="1">Proceedings are <a
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href="http://www.w3.org/2005/10/Process-20051014/comm.html#confidentiality-levels"
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shape="rect">public</a></td>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Initial Chairs</th>
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<td rowspan="1" colspan="1">Erik Mannens, Raphaël Troncy </td>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Initial Team Contact <br />
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(FTE %: 30)</th>
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<td rowspan="1" colspan="1">Yves Lafon </td>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Usual Meeting Schedule</th>
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<td rowspan="1" colspan="1">Teleconferences: Weekly <br />
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Face-to-face: 3-4 per year</td>
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</tr>
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</tbody>
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</table>
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<div class="scope">
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<h2 id="scope">Scope</h2>
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<p>This group is chartered to provide URI-based mechanisms for uniquely
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identifying temporal and spatial fragments for media objects in the Web, such
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as video, audio, and images. The Group will investigate the several
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possibilities in the URI syntax, such as URI fragment identifier or query
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parameters, to address a region of a media object and the impact at the
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application level.</p>
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<p>In order to make video a first-class object on the World Wide Web, one
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should be able to identify temporal and spatial regions. Having global
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identifiers for arbitrary media segments/fragments would allow substantial
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benefits, including in linking, bookmarking, caching and indexing. For example,
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one should be able to point to the 20th second of the video news report,
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bringing you directly to a specific news item within the report. Another
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example is the ability to identify individuals or objects that are featured in
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the video. None of the existing solutions (such as MPEG-21 or temporal URI) is
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fully satisfactory or provides a general unique resource identifier for video
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clips independently of the format in use. The <a
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href="http://www.w3.org/2007/08/video/report.html#Deep_linking_into_Video_content">report
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from the Video on the Web workshop</a> contains a summary of the current
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situation but it is expected that the Group will analyze past attempts as well.
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In addition, such mechanisms are also applicable for audio objects (temporal
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dimension), and images (spatial dimension). In response, the Media Fragments
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Working Group will investigate the existing solutions and approaches, such as
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MPEG-21, SVG, SMIL, or temporal URI.</p>
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<p>The Group will focus on developing a mechanism to uniquely identify a
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temporal fragment within an audio or video object, that is independent of the
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underlying audio or video codec in use, and will also investigate the delivery
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of the requested resource to allow full or partial media retrieval using at
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least the HTTP protocol. Furthermore, the Group will provide the partial
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mapping between the developed URI syntax and the various ways of defining in
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XML or URI a temporal or a spatial region in W3C Recommendations such as SVG
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and SMIL.</p>
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<p>The Group may hold Workshops, Interoperability Meetings, and other events as
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required to fulfill its mission.</p>
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<h3>Success Criteria</h3>
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<ul>
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<li>Provide an URI-based mechanism to identify and link into video, audio,
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and images content, as well as recommendations for delivery of partial
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content.</li>
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<li>Production of stable documents addressing the work items listed in the <a
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href="#deliverables">Deliverables</a> section.</li>
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<li>Test suites for each deliverable with conformance criteria</li>
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<li>Availability of at least two implementations of each deliverable with
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conformance criteria, as demonstrated by an implementation report
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(summarizing implementation status against the relevant test suite) for
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each testable class of product, including user agents</li>
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</ul>
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<div>
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<h3>Out of Scope</h3>
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<p>This Working Group is not chartered to provide indirect mechanisms for
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temporal and spatial fragments, such as using XML descriptions. It will,
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however, recommend a mapping between the mechanisms existing in SVG and SMIL,
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and the developed URI syntax.</p>
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</div>
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<div>
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<h2 id="deliverables">Deliverables</h2>
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<p>The Deliverables are divided in two phases, to allow rapid deployment of
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temporal and simple spatial media fragment URIs. Note that work on the second
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phase will depend on the success of the first Recommendation and will
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necessitate Director's approval for the charter extension for its
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completion.</p>
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<p>The <strong>first phase</strong> will include:</p>
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<ul>
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<li>A W3C Working Group Note for use cases and requirements for constructing
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temporal media fragment URIs for audio and video content, and simple
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spatial media fragment URIs for still images.</li>
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<li>A W3C Recommendation for constructing simple spatial and temporal media
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fragment URIs (Media Fragments 1.0). This would also include delivery
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considerations.</li>
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</ul>
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<p>The <strong>second phase</strong> will include:</p>
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<ul>
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<li>A W3C Working Group Note for use cases and requirements for constructing
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spatio-temporal media fragment URIs for video content (including complex
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spatial regions for still images).</li>
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<li>A W3C Recommendation for constructing spatio-temporal media fragment URI
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(Media Fragments 2.0)</li>
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</ul>
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<div id="ig-other-deliverables">
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<h3>Other Deliverables</h3>
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<ul>
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<li>Comprehensive implementation test suite for the specification.</li>
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<li>Implementation and interoperability reports.</li>
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<li>Analysis of existing solutions and approaches and their shortcomings</li>
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<li>Analysis of constraints for creating a spatio-temporal URI specification
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on top of the existing URI standard (http://www.ietf.org/rfc/rfc3986.txt),
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e.g. fragment and query addressing, media types, protocol schemes, and URI
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templates</li>
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<li>Tutorial or primer resources (if suitable and if resources are
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available).</li>
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<li>Mapping of the identifier mechanism to and from SMIL, SVG and HTML media
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objects.</li>
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<li>Propose a new charter for follow on work on spatial and temporal media
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fragments.</li>
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</ul>
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</div>
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<div>
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<h3>Milestones</h3>
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<p>In the interest of producing of delivering the easiest and most achievable
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work within a small timeline, the Group will focus at producing the first phase
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first. Depending on the success of the Group, the charter will need to get
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extended in order to complete the second phase.</p>
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<p><strong>Note:</strong> See changes from this initial schedule on the <a href="/2008/WebVideo/Fragments/">group home page</a>.</p>
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<table class="roadmap" width="80%">
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<caption>Milestones</caption>
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<tfoot>
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<tr>
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<td colspan="6" rowspan="1">Note: The group will document significant
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changes from this initial schedule on the group home page.</td>
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</tr>
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</tfoot>
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<tbody>
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<tr>
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<th rowspan="1" colspan="1">Specification</th>
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<th rowspan="1" colspan="1"><acronym
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title="First Working Draft">FPWD</acronym> </th>
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<th rowspan="1" colspan="1"><acronym
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title="Last Call Working Draft">LC</acronym> </th>
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<th rowspan="1" colspan="1"><acronym
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title="Candidate Recommendation">CR</acronym> </th>
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<th rowspan="1" colspan="1"><acronym
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title="Proposed Recommendation">PR</acronym> </th>
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<th rowspan="1" colspan="1"><acronym title="Recommendation">Rec</acronym>
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</th>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Use cases and requirements for Media Fragments 1.0</th>
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<td class="WD1" rowspan="1" colspan="1">November 2008</td>
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<td class="LC" rowspan="1" colspan="1">December 2008</td>
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<td class="CR" rowspan="1" colspan="1"></td>
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<td class="PR" rowspan="1" colspan="1"></td>
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<td class="REC" rowspan="1" colspan="1"></td>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Media Fragments 1.0</th>
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<td class="WD1" rowspan="1" colspan="1">February 2009</td>
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<td class="LC" rowspan="1" colspan="1">June 2009</td>
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<td class="CR" rowspan="1" colspan="1">September 2009</td>
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<td class="PR" rowspan="1" colspan="1">November 2009</td>
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<td class="REC" rowspan="1" colspan="1">January 2010</td>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Use cases and requirements for Media Fragments 2.0</th>
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<td class="WD1" rowspan="1" colspan="1">November 2009</td>
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<td class="LC" rowspan="1" colspan="1">January 2010</td>
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<td class="CR" rowspan="1" colspan="1"></td>
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<td class="PR" rowspan="1" colspan="1"></td>
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<td class="REC" rowspan="1" colspan="1"></td>
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</tr>
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<tr>
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<th rowspan="1" colspan="1">Media Fragments 2.0</th>
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<td class="WD1" rowspan="1" colspan="1">November 2009</td>
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<td class="LC" rowspan="1" colspan="1">March 2010</td>
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<td class="CR" rowspan="1" colspan="1">July 2010</td>
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<td class="PR" rowspan="1" colspan="1">November 2010</td>
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<td class="REC" rowspan="1" colspan="1">January 2011</td>
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</tr>
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</tbody>
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</table>
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<p><em>Note:</em> The Use Cases and Requirements will evolve in phases to
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follow the phases of the Recommendation.</p>
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</div>
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<div>
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<h3 id="timeline">Timeline View Summary</h3>
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<ul>
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<li>August 2008: First teleconference</li>
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<li>October 2008: First face-to-face meeting</li>
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<li>November 2008: FPWD Use Cases and Requirements (Phase 1)</li>
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<li>December 2008: LC for Use Cases and Requirements (Phase 1)</li>
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<li>January 2009: Second face-to-face meeting</li>
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<li>February 2009: FPWD for Media Fragments 1.0</li>
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<li>March 2009: Third face-to-face meeting</li>
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<li>June 2009: LC for Media Fragments 1.0</li>
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<li>September 2009: CR for Media Fragments 1.0</li>
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<li>November 2009: FPWD Use Cases and Requirements (Phase 2) and Media
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Fragments 2.0, and PR for Media Fragments 1.0</li>
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<li>January 2010: REC for Media Fragments 1.0 and LC for Use Cases and
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Requirements (Phase 2)</li>
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<li>January 2010: LC for Media Fragments 2.0</li>
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<li>March 2010: Third face-to-face meeting</li>
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<li>July 2010: CR for Media Fragments 2.0</li>
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<li>November 2010: PR for Media Fragments 2.0</li>
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<li>January 2011: REC for Media Fragments 2.0</li>
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</ul>
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</div>
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</div>
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<div class="dependencies">
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<h2 id="coordination">Dependencies and Liaisons</h2>
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<p>As part of the Video in the Web Activity, the Media Fragment Working Group
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will be represented in the Hypertext Coordination Group. </p>
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<h3>Dependencies with W3C Groups</h3>
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<dl>
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<dt>Synchronized Multimedia (SYMM) Working Group</dt>
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<dd>The Synchronized Multimedia Integration Language (SMIL) allows authors
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to describe the temporal behavior of a multimedia presentation, associate
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hyperlinks with media objects and describe the layout of the presentation
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on a screen.</dd>
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<dt>Scalable Vector Graphics (SVG) Working Group</dt>
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<dd>The Scalable Vector Graphics language allows authors to describe
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two-dimensional vector and mixed vector/raster graphics. It includes
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support for multimedia: audio, video and animation.</dd>
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<dt>HTML Working Group</dt>
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<dd>The HTML 5 specification is intended to provide a semantic-level markup
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language and associated semantic-level scripting APIs for authoring
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accessible pages on the Web ranging from static documents to dynamic
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applications. It includes media elements to present audio data, or video
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and audio data.</dd>
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<dt>Protocols and Formats Working Group</dt>
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<dd>The PFWG looks at the formal Web technologies (protocols, formats,
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etc.) from an accessibility perspective. </dd>
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</dl>
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<h3>Liaisons with W3C Groups</h3>
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<dl>
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<dt>Protocols and Formats Working Group</dt>
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<dd>The PFWG looks at the formal Web technologies (protocols, formats,
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etc.) from an accessibility perspective. </dd>
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<dt>Hypertext Coordination Group</dt>
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<dd>The purpose of this group is to identify technical areas where
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different working groups may overlap, encourage discussion, and to
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coordinate their work. </dd>
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<dt>Technical Architecture Group (TAG)</dt>
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<dd>W3C has created the TAG to document and build consensus around
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principles of Web architecture. This Group published several materials
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related to URIs, such as <cite><a
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href="http://www.w3.org/2001/tag/doc/hash-in-url">Usage Patterns For
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Client-Side URL parameters</a></cite>.</dd>
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<dt>uri@w3.org mailing list</dt>
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<dd>While the URI Activity has been closed, this mailing list remains in
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effect and should be kept in the loop.</dd>
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<dt>public-sweo-ig@w3.org mailing list </dt>
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<dd>While the Semantic Web Education and Outreach (SWEO) Interest Group has
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been closed this mailing list remains in effect and should be kept in the
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loop. The <a href="http://www.w3.org/TR/cooluris">Cool URIs for the
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Semantic Web</a> is one of the Interest Group Notes produced by the SWEO
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Group.</dd>
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</dl>
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<div>
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<h3>External Groups</h3>
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<dl>
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<dt>Internet Engineering Task Force (IETF)</dt>
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<dd>The IETF is a large open international community of network designers,
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operators, vendors, and researchers concerned with the evolution of the
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Internet architecture and the smooth operation of the Internet. This
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organisation is responsible for RFC 3986 (URI), RFC 3987 (IRI), RFC 2326
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(RTSP), RFC 2912 (Media Features for MIME Content), and for discussion
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around video, audio, and image media types. </dd>
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<dt>ISO/IEC JTC-1/SC-29 WG 11 Moving Picture Experts Group (MPEG)</dt>
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<dd>This group is developing standards for coded representation of digital
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audio and video, including MPEG-4 and MPEG-21. </dd>
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<dt>The Society of Motion Picture and Television Engineers (SMPTE) </dt>
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<dd>This organization was founded to advance theory and development in the
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motion imaging field. Among others, it produced the "SMPTE STANDARD for
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Television, Audio and Film - Time and Control Code" (SMPTE 12M). </dd>
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<dt>The Internet Captioning Forum (ICF)</dt>
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<dd>This organization addresses the technical challenges presented by
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online video repurposed from broadcast or other previously captioned
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sources, as well as video created specifically for the Web.</dd>
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</dl>
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</div>
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</div>
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<div class="participation">
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<h2 id="participation">Participation</h2>
|
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<p>To be successful, the Media Fragments Working Group is expected to have 7 or
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more active participants for its duration. Effective participation to the Media
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Fragments Working Group is expected to consume one work day per week for each
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participant until Last Call; two days per week for editors. The Media Fragments
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Working Group will allocate also the necessary resources for building Test
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Suites for each specification.</p>
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<p>Participants are reminded of the <a
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href="http://www.w3.org/2005/10/Process-20051014/groups.html#good-standing"
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shape="rect">Good Standing requirements</a> of the W3C Process.</p>
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</div>
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|
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<div class="communication">
|
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<h2 id="communication">Communication</h2>
|
|
|
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<p>This group primarily conducts its work on the public mailing list
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public-media-fragment@w3.org.</p>
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<p>Information about the group (deliverables, participants, face-to-face
|
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meetings, teleconferences, etc.) is available from the Media Fragments Working
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Group home page.</p>
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</div>
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|
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<div class="decisions">
|
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<h2 id="decisions">Decision Policy</h2>
|
|
|
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<p>As explained in the Process Document (<a
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href="http://www.w3.org/Consortium/Process/policies#Consensus"
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shape="rect">section 3.3</a>), this group will seek to make decisions when
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there is consensus. When the Chair puts a question and observes dissent, after
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due consideration of different opinions, the Chair should record a decision
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(possibly after a formal vote) and any objections, and move on.</p>
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<p>This charter is written in accordance with <a
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href="http://www.w3.org/Consortium/Process/policies#Votes" shape="rect">Section
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3.4, Votes</a> of the W3C Process Document and includes no voting procedures
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beyond what the Process Document requires.</p>
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</div>
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<div class="patent">
|
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<h2 id="patentpolicy">Patent Policy</h2>
|
|
|
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<p>This Working Group operates under the <a
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|
href="http://www.w3.org/Consortium/Patent-Policy-20040205/" shape="rect">W3C
|
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Patent Policy</a> (5 February 2004 Version). To promote the widest adoption of
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Web standards, W3C seeks to issue Recommendations that can be implemented,
|
|
according to this policy, on a Royalty-Free basis.</p>
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<p>For more information about disclosure obligations for this group, please see
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the <a href="http://www.w3.org/2004/01/pp-impl/" shape="rect">W3C Patent Policy
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|
Implementation</a>.</p>
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</div>
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<h2 id="about">About this Charter</h2>
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<p>This charter for the Media Fragments Working Group has been created
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according to <a href="http://www.w3.org/Consortium/Process/groups#GAGeneral"
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shape="rect">section 6.2</a> of the <a
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|
href="http://www.w3.org/Consortium/Process" shape="rect">Process Document</a>.
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In the event of a conflict between this document or the provisions of any
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|
charter and the W3C Process, the W3C Process shall take precedence.</p>
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<p>Change notes:</p>
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|
<ul>
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<li>December 2008: Edited in place in to correct
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|
the inconsistencies between the milestones and the timeline view summary.</li>
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|
<li>10 February 2010: Charter extended to 31 January 2011.</li>
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</ul>
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|
<hr />
|
|
<address>
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|
Philippe Le Hégaret, <a href="mailto:plh@w3.org">plh@w3.org</a>
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|
</address>
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|
<p class="copyright"><a rel="Copyright"
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|
href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
|
|
shape="rect">Copyright</a>© 2008 <a href="http://www.w3.org/"
|
|
shape="rect"><acronym title="World Wide Web Consortium">W3C</acronym> </a>
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|
<sup>®</sup>( <a href="http://www.csail.mit.edu/" shape="rect"><acronym
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|
title="Massachusetts Institute of Technology">MIT</acronym> </a>, <a
|
|
href="http://www.ercim.org/" shape="rect"><acronym
|
|
title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym>
|
|
</a>, <a href="http://www.keio.ac.jp/" shape="rect">Keio</a>), All Rights
|
|
Reserved.</p>
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|
<p>$Date: 2010/02/10 13:33:39 $</p>
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</div>
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</div>
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