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<title>SMIL:多媒体标记</title>
SMIL:多媒体标记<a href="mailto:shvatz@wired.com">Shvatz</a>
<p><b>第三页:基础知识</b></p>
<p>SMIL的好处是它的结构很象HTML,所以不难掌握它的基础知识。实际上,最基本的SMIL文档看起来与基本的HTML文档基本相同:</p>
<p> </p>
<ul>
<pre>
<smil>
<head>
</head>
<body>
</body>
</smil>
</pre>
</ul>
<p>用<smil>标记符替换<html>标记符,就得到一个SMIL文档。SMIL的另一个好处是它的核心功能基于这两个标记符:<par>和<seq>。知道了这两个标记符,就可以写SMIL表达式了。当你知道<par>是"parallel"的缩写,<seq>是"sequence"的缩写时,它们的功能就显而易见了。所以可以把<par>放在想要开始播放媒体的地方,把<seq>放在播放某个序列条目的地方。这两个标记符可以嵌套,所以可以在子序列中开始几个平行的其它媒体对象,或者可以在一个序列中平行地播放几个对象。SMIL媒体类型的表示与HTML略有不同。图像的表示几乎相同,但是因为所有XML标记符不需要第二个结束标记符,所以需要一个反斜线放在结尾。因此:</p>
<ul>
<tt> <img src="http://www.hotwired.com/images/thing.gif"> </tt>
</ul>
<p>变成:</p>
<ul>
<tt> <img src="http://www.hotwired.com/images/thing" /> </tt>
</ul>
<p>注意我们没有明确指明我们在调用一个GIF图像。SMIL独立地处理这种情况,从服务器、操作系统,或者SMIL中的"type"属性中提取信息。这不如开始时那么复杂:SMIL知道我们在标记符中处理图像,所以不需要直接指明是GIF图像。当然,既然它是一种多媒体标记语言,它就包含了不只图像一种媒体类型。有效的媒体类型包括音频、动画、a(anchor标记符)、ref(通用的媒体类型指示,用在不能确定媒体类型时)、img、文本、文本流、视频,当然还有par和seq标记符。<a href="day1_4.html">>></a></p>
<p><b>SMIL:多媒体标记</b><br>
<font color="#FF0000"> 第一页</font> <a href="day1_1.html">多媒体标记</a><br>
<font color="#FF0000">第二页</font> <a href="day1_2.html">进入SMIL</a><br>
<font color="#FF0000">第三页</font> 基础知识<br>
<font color="#FF0000">第四页</font> <a href="day1_4.html">结构</a></p>
<p>[第1天][<a href="day2_1.html">第2天</a>]</p>
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