xslt 1.0 - 通过多个条件查找唯一值 [英] xslt 1.0 - find unique values by several criteria

问题描述

我有以下 XML:

<library>
<elements>
    <element name="books">
        <property name="author">A</property>
        <property name="select">true</property>
    </element>
    <element name="books">
        <property name="author">B</property>
        <property name="select">false</property>
    </element>  
    <element name="books">
        <property name="author">C</property>
        <property name="select">true</property>
    </element>  
    <element name="books">
        <property name="author">A</property>
        <property name="select">true</property>
    </element>  
</elements>
</library>

我需要获取所有 name="books" 元素的输出，这些元素被选中 (selected = true) 并且按作者姓名是唯一的.必须使用 xslt 1.0.

I need to get output of all elements with name="books", which are selected (selected = true) and unique by author name. Must use xslt 1.0.

预期结果:作者:A作者:C

Expected result: author: A author: C

必须只输出作者 A 和 C 的数据.

Must output data only for authors A and C.

提前致谢！

推荐答案

 not(.=preceding::*) 

在for循环中检索给定xpath的唯一值

to retrieve the unique values of the given xpath in for loop

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
      <xsl:output method="text"/>

     <xsl:template match="/">           
        <ul> 
      <xsl:for-each select="//elements/element[@name = 'books' and property[@name = 'select' and .='true'] ]/property[@name = 'author' and not(.=preceding::*)]">
    <li>
      <xsl:value-of select="concat('author :',.)"/>
        </li>   
      </xsl:for-each>            
</ul>
  </xsl:template>

</xsl:stylesheet>

输出 XML :

作者:作者:C

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