可以轻松检索元素的注释。
comment()-获取属性"name"的值。
<xsl:value-of select = "/class/student/preceding-sibling::comment()"/>
示例
在此示例中，我们创建了一个样本XML文档 students.xml 及其样式表文档 students.xsl ，该文档使用XPath表达式。
students.xml
<?xml version = "1.0"?> <?xml-stylesheet type = "text/xsl" href="students.xsl"?> <class> <!-- Comment: This is a list of student --> <student rollno = "393"> <firstname>Dinkar</firstname> <lastname>Kad</lastname> <nickname>Dinkar</nickname> <marks>85</marks> </student> <student rollno = "493"> <firstname>Vaneet</firstname> <lastname>Gupta</lastname> <nickname>Vinni</nickname> <marks>95</marks> </student> <student rollno = "593"> <firstname>Jasvir</firstname> <lastname>Singh</lastname> <nickname>Jazz</nickname> <marks>90</marks> </student> </class>
students.xsl
<?xml version = "1.0" encoding = "UTF-8"?>
<xsl:stylesheet version = "1.0"
xmlns:xsl = "http://www.w3.org/1999/XSL/Transform">
<xsl:template match = "/">
<html>
<body>
<h3>Comment(). Xpath expression="/class/student/preceding-sibling::comment()"</h3>
</span><span class="tag"><xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"/class/student/preceding-sibling::comment()"</span><span class="tag">/></span><span class="pln">
</span><span class="tag"><table</span><span class="pln"> </span><span class="atn">border</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"1"</span><span class="tag">></span><span class="pln">
</span><span class="tag"><tr</span><span class="pln"> </span><span class="atn">bgcolor</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"#9acd32"</span><span class="tag">></span><span class="pln">
</span><span class="tag"><th></span><span class="pln">Roll No</span><span class="tag"></th></span><span class="pln">
</span><span class="tag"><th></span><span class="pln">First Name</span><span class="tag"></th></span><span class="pln">
</span><span class="tag"><th></span><span class="pln">Last Name</span><span class="tag"></th></span><span class="pln">
</span><span class="tag"><th></span><span class="pln">Nick Name</span><span class="tag"></th></span><span class="pln">
</span><span class="tag"><th></span><span class="pln">Marks</span><span class="tag"></th></span><span class="pln">
</span><span class="tag"></tr></span><span class="pln">
</span><span class="tag"><xsl:for-each</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"/class/student"</span><span class="tag">></span><span class="pln">
</span><span class="tag"><tr></span><span class="pln">
</span><span class="tag"><td><xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"@rollno"</span><span class="tag">/></td></span><span class="pln">
</span><span class="tag"><td><xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"firstname"</span><span class="tag">/></td></span><span class="pln">
</span><span class="tag"><td><xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"lastname"</span><span class="tag">/></td></span><span class="pln">
</span><span class="tag"><td><xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"nickname"</span><span class="tag">/></td></span><span class="pln">
</span><span class="tag"><td><xsl:value-of</span><span class="pln"> </span><span class="atn">select</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="atv">"marks"</span><span class="tag">/></td></span><span class="pln">
</span><span class="tag"></tr></span><span class="pln">
</span><span class="tag"></xsl:for-each></span><span class="pln">
</span><span class="tag"></table></span><span class="pln">
</span><span class="tag"></body></span><span class="pln">
</span><span class="tag"></html></span><span class="pln">
</xsl:template>
</xsl:stylesheet>
验证输出
