< XSL:密钥GT; tag元素指定分配给XML文档中特定元素的命名名称 - 值对.此密钥与XPath表达式中的key()函数一起使用,以访问XML文档中指定的元素.
以下是语法声明< xsl:key> 元素.
<xsl:key name = QName match = Pattern use = Expression > </xsl:key>
S.No | 名称&描述 |
---|---|
1 | 名称 要使用的密钥的名称. |
2 | 匹配 用于的模式识别持有此密钥的节点. |
3 | 使用 XPath表达式来标识节点的值xml文档. |
出现次数 | 无限 |
父元素 | |
儿童元素 | 无 |
此示例创建一个< student>的表格.元素及其属性 rollno 及其子元素< firstname>,< lastname>,< nickname>和< marks>通过迭代每个学生.它将键作为名字检查为学生姓名之一,然后打印学生详细信息.
students.xml
<?xml version = "1.0"?> <?xml-stylesheet type = "text/xsl" href = "students.xsl"?> <class> <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
<xsl:stylesheet version = "1.0" xmlns:xsl = "http://www.w3.org/1999/XSL/Transform"> <xsl:key name = "firstname-search" match = "student" use = "firstname"/> <xsl:template match = "/"> <html> <body> <h2>Students</h2> <table border = "1"> <tr bgcolor = "#9acd32"> <th>Roll No</th> <th>First Name</th> <th>Last Name</th> <th>Nick Name</th> <th>Marks</th> </tr> <xsl:for-each select = "key('firstname-search', 'Dinkar')"> <tr> <td><xsl:value-of select = "@rollno"/></td> <td><xsl:value-of select = "firstname"/></td> <td><xsl:value-of select = "lastname"/></td> <td><xsl:value-of select = "nickname"/></td> <td><xsl:value-of select = "marks"/></td> </tr> </xsl:for-each> </table> </body> </html> </xsl:template> </xsl:stylesheet>