XHTML三种文件类型声明_HTML/Xhtml_网页制作
XHTML定义了三种文件类型声明。
最普遍使用的是XHTML Transitional。 是强制使用的。
一个XHTML文档有三个主要的部分： DOCTYPE Head Body
基本的文档结构是这样的：
..>
在XHTML文档中，文档类型声明总是位于首行。 一个XHTML的实例
这个一个简单的（最小化的）XHTML文档：
-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
a simple paragraph
文档类型声明定义文档的类型：
-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
文档的其余部分类似HTML：
a simple paragraph
3种文档类型声明 DTD规定了使用通用标记语言(SGML)的网页的语法。 诸如HTML这样的通用标记语言应用使用DTD来规定应用于某种特定文档中的标签的规则，这些规则包括一系列的元素和实体的声明。 在通用标记语言(SGML)的文档类型声明或DTD中，XHTML被详细地进行了描述。 XHTML DTD使用精确的可被计算机读取的语言来描述合法的XHTML标记的语法和句法。 存在三种XHTML文档类型： STRICT（严格类型） TRANSITIONAL（过渡类型） FRAMESET（框架类型） XHTML 1.0的三种XML文档类型XHTML 1.0规定了三种XML文档类型，以对应上述三种DTD。 XHTML 1.0 Strict
-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/
xhtml1-strict.dtd">
在这样的情况下使用：需要干净的标记，避免表现上的混乱。请与层叠样式表配合使用。 XHTML 1.0 Transitional
-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/
xhtml1-transitional.dtd">
在这样的情况下使用：当需要利用HTML在表现上的特性时，并且当需要为那些不支持层叠样式表的浏览器编写XHTML时。 XHTML 1.0 Frameset
-//W3C//DTD XHTML 1.0 Frameset//EN""http://www.w3.org/TR/xhtml1/DTD/
xhtml1-frameset.dtd">
在这样的情况下使用：需要使用HTML框架将浏览器窗口分割为两部分或更多框架时。
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