查找最大节点值 [英] Find max node value

问题描述

我有一个下面给出的xml:

I have a xml given below:

<root title="الصفحة الرئيسة">
   <item title="الصفحة الرئيسة" itemuri="tcm:8-29-4" ShowInNav="True" type="sg" pageuri="tcm:8-10592-64" sLink="/ara/index.aspx">
      <item title="من نحن" itemuri="tcm:8-779-4" ShowInNav="True" type="sg" pageuri="tcm:8-9934-64" navorder="00500" sLink="/ara/about/index.aspx">
      </item>
      <item title="برامجنا" itemuri="tcm:8-817-4" ShowInNav="True" type="sg" pageuri="tcm:8-10112-64" navorder="00100" sLink="/ara/courses/language-study-abroad.aspx">
      </item>
      <item title="مدارسنا" itemuri="tcm:8-824-4" ShowInNav="True" type="sg" pageuri="tcm:8-10162-64" navorder="00300" sLink="/ara/schools/english-language.aspx"> 
      </item> 
   </item>
</root>

现在我想要最大navorder的值，以便我可以在if"条件下进一步使用该值.

Now I want to the value of maximum navorder, so that I can use that value further in "if" condition.

推荐答案

以下是两种可能的解决方案的 XSLT 1.0 代码.

第三种解决方案是使用EXSLT.

第四种解决方案是使用FXSL.

A fourth solution is to use the maximum template of FXSL.

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

    <xsl:template match="/">
      <xsl:variable name="vMax1" select=
       "*/*/*/@navorder[not(. &lt; ../../*/@navorder)][3]"/>

       $vMax1: <xsl:value-of select="$vMax1"/>

      <xsl:variable name="vMax2">
        <xsl:call-template name="max">
          <xsl:with-param name="pSeq" 
               select="*/*/*/@navorder"/>
        </xsl:call-template>
      </xsl:variable>

       $vMax2: <xsl:value-of select="$vMax2"/>

    </xsl:template>

    <xsl:template name="max">
      <xsl:param name="pSeq"/>

      <xsl:variable name="vLen" select="count($pSeq)"/>

      <xsl:if test="$vLen > 0">
        <xsl:choose>
          <xsl:when test="$vLen = 1">
            <xsl:value-of select="$pSeq[1]"/>
          </xsl:when>
          <xsl:otherwise>
            <xsl:variable name="vHalf" 
             select="floor($vLen div 2)"/>

            <xsl:variable name="vMax1">
              <xsl:call-template name="max">
                <xsl:with-param name="pSeq" 
                 select="$pSeq[not(position() > $vHalf)]"/>
              </xsl:call-template>
            </xsl:variable>

            <xsl:variable name="vMax2">
              <xsl:call-template name="max">
                <xsl:with-param name="pSeq" 
                 select="$pSeq[position() > $vHalf]"/>
              </xsl:call-template>
            </xsl:variable>

            <xsl:choose>
              <xsl:when test="$vMax1 >= $vMax2">
                <xsl:value-of select="$vMax1"/>
              </xsl:when>
              <xsl:otherwise>
                <xsl:value-of select="$vMax2"/>
              </xsl:otherwise>
            </xsl:choose>
          </xsl:otherwise>
        </xsl:choose>
      </xsl:if>
    </xsl:template>
</xsl:stylesheet>

当上述转换应用于原始 XML 文档时:

When the above transformatio is applied on the original XML document:

<root title="الصفحة الرئيسة">
    <item title="الصفحة الرئيسة" itemuri="tcm:8-29-4"
          ShowInNav="True" type="sg"
          pageuri="tcm:8-10592-64"
          sLink="/ara/index.aspx">
        <item title="من نحن" itemuri="tcm:8-779-4"
              ShowInNav="True" type="sg"
              pageuri="tcm:8-9934-64"
              navorder="00500"
              sLink="/ara/about/index.aspx"/>
        <item title="برامجنا" itemuri="tcm:8-817-4"
              ShowInNav="True" type="sg"
              pageuri="tcm:8-10112-64"
              navorder="00100"
              sLink="/ara/courses/language-study-abroad.aspx"/>
        <item title="مدارسنا" itemuri="tcm:8-824-4"
              ShowInNav="True" type="sg"
              pageuri="tcm:8-10162-64"
              navorder="00300"
              sLink="/ara/schools/english-language.aspx"/>
  </item>
</root>

产生了想要的结果:

   $vMax1: 00500

   $vMax2: 00500

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