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XML Modules

XML Modules. Extending Web Accessibility. W3C Web Accessibility Initiative (WAI). "The power of the Web is in its universality. Access by everyone regardless of disability is an essential aspect." -- Tim Berners-Lee , W3C Director and inventor of the World Wide Web.

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XML Modules

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  1. XML Modules Extending Web Accessibility

  2. W3C Web Accessibility Initiative (WAI) "The power of the Web is in its universality. Access by everyone regardless of disability is an essential aspect." -- Tim Berners-Lee, W3C Director and inventor of the World Wide Web W3C = World Wide Web Consortium

  3. What Is an XML Module? • An XML module is a collection of semantically-related XML elements and attributes oriented toward accomplishing a certain task or function. • An excellent example of modularization is the manner in which the W3C has organized into modules the various parts of the Synchronized Multimedia Implementation Language (SMIL). • SMIL is an XML-based language that was created by the W3C for the purpose of enabling developers to include multimedia events in Web documents.

  4. Timing Time Manipulations Animation Content Control Layout Linking Media objects Metainformation Structure Transitions There are 10 SMIL Modules

  5. What Is a Language Profile? • A language profile is the combination of modules to create an XML language designed to meet certain objectives. • The W3C has created a language profile, for example, for the purpose of adding multimedia functionality to XHTML. • The name of this profile is XHTML+SMIL. • Its goal is to permit the Web designer to use SMIL animations, timings, and transitions within a conventional HTML or CSS page layout. • Thus, XHTML+SMIL omits modules related to layout. • As a result, the Web designer can create a layout via style sheets or HTML and include SMIL animations, timings, and transitions in traditional Web page elements.

  6. What Is HTML+TIME? • Microsoft has created an implementation of XHTML+SMIL called HTML+TIME, which works with Internet Explorer versions 5.5 and later. • True to its name, the most important part of HTML+TIME is the timing module, because that is how you create synchronized multimedia events. • An excellent example of a multimedia event that requires timing is the captioning of a video, which requires you to display onscreen subtitles at precise times in sync with the video.

  7. Captioning a Video with SMIL • The SMIL timing module contains a seq tag that enables you to sequence multimedia events. • The tag name <seq> stands for sequence. • You can use the seq tag to create video captions.

  8. The Moon Challenge • President John F. Kennedy’s Moon Challenge video is at the course Web site. • Its URL is: • www.udel.edu/awd/movies/KennedyMoonChallenge.avi • Let us view it captioned.

  9. How the Captioning Works • First, we modify the HTML tag to bind in the Time namespace: <HTML xmlns:t="urn:schemas-microsoft-com:time"> • Then we make the page use Time version 2: <STYLE> .time{ behavior: url(#default#time2);} </STYLE>

  10. Playing the Video • In the body of the page, the first row of a table plays the video: <TABLE CELLSPACING="0" STYLE="background-color:White;font:bold;font-size:11pt;"> <TR> <TD> <t:VIDEO CLASS="time" ID="movie" SRC="KennedyMoonChallenge.avi" /> </TD> </TR>

  11. Captioning the Video • The second row of the table captions the video as it plays: <TR> <TD ID="caption" STYLE="background-color: White;" ALIGN="center"> <t:SEQ ID="txSeq" CLASS="time“ BEGIN="movie.begin+.5"> <SPAN ID="1" CLASS="time" t:DUR="2">We choose to go to the moon in</SPAN> <SPAN ID="2" CLASS="time" t:DUR="2.5">this decade and do the other things,</SPAN>

  12. Captioning the Video(continued) <SPAN ID="3" CLASS="time" t:DUR="2.15">not because they are easy,</SPAN> <SPAN ID="4" CLASS="time" t:DUR="2.0">but because they are hard.</SPAN> <SPAN ID="5" CLASS="time" t:DUR="1.8">Because that goal</SPAN> <SPAN ID="6" CLASS="time" t:DUR="1.8">will serve to organize</SPAN> <SPAN ID="7" CLASS="time" t:DUR="1.8">and measure the best</SPAN> <SPAN ID="8" CLASS="time" t:DUR="2.2">of our energies and skills.</SPAN> <SPAN ID="9" CLASS="time" t:DUR="2.1">Because that challenge is one</SPAN> <SPAN ID="10" CLASS="time" t:DUR="1.9">that we're willing to accept,</SPAN> <SPAN ID="11" CLASS="time" t:DUR="2.2">one we are unwilling to postpone,</SPAN> <SPAN ID="12" CLASS="time" t:DUR="2.3">and one we intend to win,</SPAN> <SPAN ID="13" CLASS="time" t:DUR="3">and the others too.</SPAN></t:SEQ> </TD> </TR> </TABLE>

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