Xml XSL if-else条件
我有一个要求,我希望使用if-else语句来检查一个节点是否有属性或者它只有字符串 例如:一个节点找到了Xml XSL if-else条件,xml,xslt,xpath,Xml,Xslt,Xpath,我有一个要求,我希望使用if-else语句来检查一个节点是否有属性或者它只有字符串 例如:一个节点找到了0个文件,另一个节点有属性,如 下面是两个节点的示例 <product> <autoIncludeUser>0 File(s) found</autoIncludeUser> <autoIncludeSystem> <autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='
0个文件
,另一个节点有属性,如
下面是两个节点的示例
<product>
<autoIncludeUser>0 File(s) found</autoIncludeUser>
<autoIncludeSystem>
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='64' filename='AFP_p.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='3,879' filename='AnalystsExpressionMacros.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='475' filename='base64Converter.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='<DIR>' filename='codePages' />
</autoIncludeSystem>
<autoIncludeStudio>0 File(s) found</autoIncludeStudio>
<externalLibrarySystem>
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='196,608' filename='AFPtoXML_DP.dll' />
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='13,259' filename='ASN1toXSDRunner.jar' />
<externalLibrarySystem>
</product>
找到0个文件
找到0个文件
我如何识别一个节点是否只有字符串或属性,并基于此,我可以分别获得
String
或attrib值
。我们可以使用下面的代码实现if-else
<xsl:choose>
<xsl:when test="something to test">
</xsl:when>
<xsl:otherwise>
</xsl:otherwise>
</xsl:choose>
这就是我所做的
<h3>System</h3>
<xsl:choose>
<xsl:when test="autoIncludeSystem/autoincludesystem_info/@mdate"> <!-- if attribute exists-->
<p>
<dd><table border="1">
<tbody>
<tr>
<th>File Name</th>
<th>File Size</th>
<th>Date</th>
<th>Time</th>
<th>AM/PM</th>
</tr>
<xsl:for-each select="autoIncludeSystem/autoincludesystem_info">
<tr>
<td valign="top" ><xsl:value-of select="@filename"/></td>
<td valign="top" ><xsl:value-of select="@filesize"/></td>
<td valign="top" ><xsl:value-of select="@mdate"/></td>
<td valign="top" ><xsl:value-of select="@mtime"/></td>
<td valign="top" ><xsl:value-of select="@ampm"/></td>
</tr>
</xsl:for-each>
</tbody>
</table>
</dd>
</p>
</xsl:when>
<xsl:otherwise> <!-- if attribute does not exists -->
<dd><pre>
<xsl:value-of select="autoIncludeSystem"/><br/>
</pre></dd> <br/>
</xsl:otherwise>
</xsl:choose>
系统
文件名
文件大小
日期
时间
上午/下午
我的输出
XPath
/*[非(@*)]
将选择所有没有属性的元素 使用xsl:choose
可以很容易地做到这一点,但在XSLT中,更好的条件处理方法是编写不同的模板规则来处理不同的条件。因此,用match=“*[@*]”
编写一个模板规则来匹配具有属性的元素,用match=“*[text()]”
编写另一个模板规则来匹配具有文本内容的元素。您可以将整个xsl:choose
指令替换为:
<xsl:template match="autoIncludeSystem[autoincludesystem_info/@*]>
<!-- code for elements with attributes (xsl:when) -->
</xsl:template>
<xsl:template match="autoIncludeSystem[not(autoincludesystem_info/@*)]>
<!-- code for elements without attributes (xsl:otherwise) -->
</xsl:template>
然后添加两个模板:
concat(substring('String', 1 div boolean(text())),
' ',
substring('attrib values', 1 div boolean(@*))
)
I.Xpath 1.0解决方案-使用此Xpath表达式:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"concat(substring('String', 1 div boolean(text())),
' ',
substring('attrib values', 1 div boolean(@*))
)
"/>
</xsl:template>
</xsl:stylesheet>
<product>
<autoIncludeUser>0 File(s) found</autoIncludeUser>
<autoIncludeSystem>
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='64' filename='AFP_p.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='3,879' filename='AnalystsExpressionMacros.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='475' filename='base64Converter.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='<DIR>' filename='codePages' />
</autoIncludeSystem>
<autoIncludeStudio>0 File(s) found</autoIncludeStudio>
<externalLibrarySystem>
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='196,608' filename='AFPtoXML_DP.dll' />
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='13,259' filename='ASN1toXSDRunner.jar' />
</externalLibrarySystem>
</product>
if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
"/>
</xsl:template>
</xsl:stylesheet>
这里是一个基于XSLT的验证:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"concat(substring('String', 1 div boolean(text())),
' ',
substring('attrib values', 1 div boolean(@*))
)
"/>
</xsl:template>
</xsl:stylesheet>
<product>
<autoIncludeUser>0 File(s) found</autoIncludeUser>
<autoIncludeSystem>
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='64' filename='AFP_p.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='3,879' filename='AnalystsExpressionMacros.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='475' filename='base64Converter.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='<DIR>' filename='codePages' />
</autoIncludeSystem>
<autoIncludeStudio>0 File(s) found</autoIncludeStudio>
<externalLibrarySystem>
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='196,608' filename='AFPtoXML_DP.dll' />
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='13,259' filename='ASN1toXSDRunner.jar' />
</externalLibrarySystem>
</product>
if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
"/>
</xsl:template>
</xsl:stylesheet>
解释我们使用以下事实:
对于任何字符串$s
,子字符串($s,无穷大)
是空字符串
1div0
是Infinity
根据定义,number(true())
为1
,number(false())
为0
II。XPath 2.0解决方案:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"concat(substring('String', 1 div boolean(text())),
' ',
substring('attrib values', 1 div boolean(@*))
)
"/>
</xsl:template>
</xsl:stylesheet>
<product>
<autoIncludeUser>0 File(s) found</autoIncludeUser>
<autoIncludeSystem>
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='64' filename='AFP_p.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='3,879' filename='AnalystsExpressionMacros.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='475' filename='base64Converter.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='<DIR>' filename='codePages' />
</autoIncludeSystem>
<autoIncludeStudio>0 File(s) found</autoIncludeStudio>
<externalLibrarySystem>
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='196,608' filename='AFPtoXML_DP.dll' />
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='13,259' filename='ASN1toXSDRunner.jar' />
</externalLibrarySystem>
</product>
if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
"/>
</xsl:template>
</xsl:stylesheet>
这在XPath2.0中要容易得多,因为该语言有标准的if/then/else
运算符
使用:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"concat(substring('String', 1 div boolean(text())),
' ',
substring('attrib values', 1 div boolean(@*))
)
"/>
</xsl:template>
</xsl:stylesheet>
<product>
<autoIncludeUser>0 File(s) found</autoIncludeUser>
<autoIncludeSystem>
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='64' filename='AFP_p.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='3,879' filename='AnalystsExpressionMacros.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='475' filename='base64Converter.tgp' />
<autoincludesystem_info mdate='08/23/2011' mtime='09:51' ampm='PM' filesize='<DIR>' filename='codePages' />
</autoIncludeSystem>
<autoIncludeStudio>0 File(s) found</autoIncludeStudio>
<externalLibrarySystem>
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='196,608' filename='AFPtoXML_DP.dll' />
<externalLibrarySystem_info mdate='08/23/2011' mtime='09:52' ampm='PM' filesize='13,259' filename='ASN1toXSDRunner.jar' />
</externalLibrarySystem>
</product>
if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*)]">
<xsl:value-of select="concat(' ', name(),': ')"/>
<xsl:value-of select=
"if(text())
then 'String'
else if(@*)
then 'attrib values'
else ()
"/>
</xsl:template>
</xsl:stylesheet>
XSLT2.0验证:
autoIncludeUser: String
autoincludesystem_info: attrib values
autoincludesystem_info: attrib values
autoincludesystem_info: attrib values
autoincludesystem_info: attrib values
autoIncludeStudio: String
externalLibrarySystem_info: attrib values
externalLibrarySystem_info: attrib values
任何例子都会有帮助,我也更新了我自己的答案,你能看看它会不会影响我的工作吗?@Abhishek,你能根据你的输入提供所需的输出吗?我在回答中提供了我的输出,所以我可以直接使用系统
?好问题,+1。请参阅我的答案,了解单个XPath 1.0表达式,该表达式实现了所需的if-then-else
逻辑:我提供了一个基于XSLT的验证和详细解释。还添加了一个XPath 2.0解决方案。查看了XML后,应该使用xs:dateTime
和xs:long
而不是蹩脚的美式类型。