XSL是可扩展样式表语言的外语缩写,是一种用于以可读格式呈现 XML(标准通用标记语言的子集)数据的语言。
万维网联盟(W3C)开始发展 XSL 的原因是:存在着对于基于 XML 的样式表语言的需求。
HTML 使用预先定义的标签,每个标签的意义很容易被理解。HTML 中的 <table> 标签定义表格 - 并且浏览器清楚如何显示它。向 HTML 元素添加样式是很容易的。通过 CSS,很容易告知浏览器用特定的字体或颜色显示一个元素。
XML 不使用预先定义的标签(我们可以使用任何喜欢的标签名),并且每个标签的意义并不都那么容易被理解。<table> 标签意味着一个 HTML 表格,一件家具,或是别的什么东西 - 浏览器不清楚如何显示它。XSL 可描述如何来显示 XML 文档!
XSL 包括三部分:
XSLT - 一种用于转换 XML 文档的语言。 XPath - 一种用于在 XML 文档中导航的语言。 XSL-FO - 一种用于格式化 XML 文档的语言。
<xsl:template> 元素用于构建模板<xsl:value-of> 元素用于提取某个选定节点的值,并把值添加到转换的输出流中<xsl:for-each> 元素可用于选取指定的节点集中的每个 XML 元素<xsl:sort>如需对结果进行排序,只要简单地在 XSL 文件中的 <xsl:for-each> 元素内部添加一个 <xsl:sort> 元素<xsl:if> 如需放置针对 XML 文件内容的条件测试,请向 XSL 文档添加 <xsl:if> 元素。<xsl:choose> 元素用于结合 <xsl:when> 和 <xsl:otherwise> 来表达多重条件测试。<xsl:apply-templates> 元素可把一个模板应用于当前的元素或者当前元素的子节点<xsl:when exPRession> 相当前于一种判断,表示当expression成立时执行的代码<xsl:otherwise expression> 它与<xsl:when>一起使用,表示当when条件不成立时,执行的代码
<?xml version="1.0" encoding="gb2312" ?><?xml-stylesheet type="text/xsl" href="templete.xsl" ?><root> <food> <name>鸡蛋</name> <price>$5</price> <info>很有营养的</info> <unit>2</unit> </food> <food> <name>煎饼</name> <price>$4.5</price> <info>早餐必备</info> <unit>1</unit> </food> <food> <name>皮蛋粥</name> <price>$2</price> <info>我的最爱</info> <unit>1</unit> </food></root>
<?xml version="1.0" encoding="gb2312" ?><xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:template match="/"> <HTML> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> </head> <BODY STYLE="font-family:微软雅黑; font-size:12pt;background-color:#fff"> <xsl:for-each select="root/food"> <DIV STYLE="background-color:#eeaaaa; color:white; padding:4px"> <SPAN STYLE="font-weight:bold; color:white"> <xsl:value-of select="name"/> </SPAN> <em> <xsl:value-of select="price"/> </em> </DIV> <DIV> <xsl:value-of select="info"/> <SPAN STYLE="font-style:italic"> (<xsl:value-of select="count" />份) </SPAN> </DIV> </xsl:for-each> </BODY> </HTML> </xsl:template></xsl:stylesheet>
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