< xsl:message> tag元素有助于调试XSLT处理.它类似于javascript警报. < XSL产品:> tag将消息缓冲到XSLT处理器，该处理器终止处理并向调用者应用程序发送消息以显示错误消息.
以下是< xsl:message> 元素的语法声明.
<xsl:message terminate = "yes" | "no" > </xsl:message>
| Sr.No | 姓名&描述 |
|---|---|
| 1 | 终止 它指定转换是否应在执行此指令时终止.默认为"是". |
| 出现次数 | 无限 |
|---|---|
| 父元素 | xsl:attribute，xsl:comment，xsl:copy，xsl:element，xsl:fallback，xsl:foreach，xsl:if，xsl:message，xsl:otherwise，xsl:param，xsl :processinginstruction，xsl:template，xsl:variable，xsl:when，xsl:with-param，output elements |
子元素 | xsl: apply-templates，xsl:attribute，xsl:call-template，xsl:choose，xsl:comment，xsl:copy，xsl:copy-of，xsl:element，xsl:for-each，xsl:if，xsl:processing-指令，xsl:text，xsl:value-of，xsl:variable，output elements |
此示例创建一个ta < student>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key作为firstname存在，然后打印学生详细信息，否则显示错误消息.
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></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> <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 = "class/student"> <xsl:if test = "firstname = ''"> <xsl:message terminate = "yes">A first name field is empty. </xsl:message> </xsl:if> <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>
