创建一个连接唯一子元素值的XSLT变量

Question

这是我的XML

<?xml version='1.0'?>
<root>
<elems>
<status>Completed</status>
<description>Records</description>
<sub_type>SEC</sub_type>
<type>FIR</type>
<result>Done</result>
</elems>
<elems>
<status>Completed</status>
<description>Records</description>
<sub_type>SEC</sub_type>
<type>FIR</type>
<result>Done</result>
</elems>
<elems>
<status>Completed</status>
<description>Morals</description>
<sub_type>GIX</sub_type>
<type>PANC</type>
<result>Done</result>
</elems>
<elems>
<status>Completed</status>
<description>Morals</description>
<sub_type>GIX</sub_type>
<type>PANC</type>
<result>Done</result>
</elems>
<elems>
<status>Completed</status>
<description>Checking</description>
<type>SSO</type>
<result>Done</result>
</elems>
</root>

我想要一个变量，它应该通过连接type和sub_type元素来给出唯一的值(因为elems元素是重复和重复的元素(，如下所示。sub_type可以是null元素。对于下面的示例，变量名称可以是vars。。

FIRSEC PANCGIX SSO 

然后我应该能够使用这个$var进行foreach

<root>
<xsl:for-each select="$vars">
<inner><xsl:value-of select="." /></inner>
</xsl:for-each>
<root>

它应该打印

<root>
<inner>FIRSEC</inner>
<inner>PANCGIX</inner>
<inner>SSO</inner>
</root>

Answer 1

在XSLT2.0中，使用distinct-values()函数是非常琐碎的

<xsl:variable name="vars" select="distinct-values(/root/elems/concat(type,sub_type))"/>

---

注意，变量是冗余的，因为您可以直接执行：

<root>
<xsl:for-each select="distinct-values(/root/elems/concat(type,sub_type))">
<inner>
<xsl:value-of select="." />
</inner>
</xsl:for-each>
</root>