PROSAGA码农传奇-可信计算-XSLT计算加权平均值

<div class =“post-text”itemprop =“text”>
  <P>
    使用XSLT 2.0，您可以轻松地将计算结果存储在序列或临时树中：
  </p>
   <pre>
    <code>
      <?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="xs"    
    version="2.0">

<xsl:output method="html" indent="yes"/>

<xsl:template match="row">
        <tr>
            <td>Average Income</td>
            
            <xsl:variable name="sales-by-day">
              <xsl:for-each-group select="field[@group = 'sales']/day" group-by="@date">
                <sales day="{current-grouping-key()}">
                  <amount><xsl:value-of select="sum(current-group()/amount)"/></amount>
                  <count><xsl:value-of select="sum(current-group()/count)"/></count>
                </sales>
              </xsl:for-each-group>
            </xsl:variable>
            <xsl:for-each select="$sales-by-day/sales">
                <td>
                    <xsl:text>$</xsl:text><xsl:value-of select="amount div count"/>
                </td>
            </xsl:for-each>

<td class="average">
                <xsl:text>$</xsl:text><xsl:value-of select="sum($sales-by-day/sales/(amount div count)) div count(field[@group = 'sales'][1]/day)"/>
            </td>

</tr>
    </xsl:template>

<xsl:template match="snap-report">
        <table class="report">
            <xsl:apply-templates select="row"/>
        </table>
    </xsl:template>
</xsl:stylesheet>

</code>
  </pre>
  <P>
    我认为以上内容可以缩短为
  </p>
   <pre>
    <code>
      <?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="xs"    
    version="2.0">

<xsl:output method="html" indent="yes"/>

<xsl:template match="row">
        <tr>
            <td>Average Income</td>
            
            <xsl:variable name="sales-by-day">
              <xsl:for-each-group select="field[@group = 'sales']/day" group-by="@date">
                <sales day="{current-grouping-key()}">
                  <xsl:value-of select="sum(current-group()/amount) div sum(current-group()/count)"/>
                </sales>
              </xsl:for-each-group>
            </xsl:variable>
            <xsl:for-each select="$sales-by-day/sales">
                <td>
                    <xsl:text>$</xsl:text><xsl:value-of select="."/>
                </td>
            </xsl:for-each>

<td class="average">
                <xsl:text>$</xsl:text><xsl:value-of select="sum($sales-by-day/sales) div count($sales-by-day/sales)"/>
            </td>

</tr>
    </xsl:template>

<xsl:template match="snap-report">
        <table class="report">
            <xsl:apply-templates select="row"/>
        </table>
    </xsl:template>
</xsl:stylesheet>

</code>
  </pre>
</DIV>