XSLT - 在这种情况下如何使用group by？

Question

（后续this线程）

我现在实际上需要知道按日期和按期间分组的访客数量。我试图通过Kirill Polishchuk建议申请该组，但我只能通过一个特定的元素将其分组。现在我真的需要知道如何应用多个分组？例如。首先按'日'分组，然后按期间分组。

我有下面的XML：

<Cinema> 
    <Day date="15-09-2011" day="Thursday" week="37" in="543" out="543"> 
     <Movie name="movie1" in="191" out="191"> 
      <Period time="16:00:00" in="20" out="20"/> 
      <Period time="18:00:00" in="71" out="70"/> 
      <Period time="20:00:00" in="100" out="101"/> 
     </Movie> 
     <Movie name="movie2" in="105" out="105"> 
      <Period time="16:00:00" in="13" out="13"/> 
      <Period time="18:00:00" in="34" out="34"/> 
      <Period time="20:00:00" in="58" out="58"/> 
     </Movie> 
     <Movie name="movie3" in="247" out="247"> 
      <Period time="16:00:00" in="57" out="57"/> 
      <Period time="18:00:00" in="75" out="72"/> 
      <Period time="20:00:00" in="115" out="118"/> 
     </Movie> 
    <Day> 
    <Day date="16-09-2011" day="Friday" week="37" in="1151" out="1151"> 
     <Movie name="movie1" in="364" out="364"> 
      <Period time="16:00:00" in="106" out="106"/> 
      <Period time="18:00:00" in="131" out="129"/> 
      <Period time="20:00:00" in="127" out="129"/> 
     </Movie> 
     <Movie name="movie2" in="333" out="333"> 
      <Period time="16:00:00" in="89" out="89"/> 
      <Period time="18:00:00" in="116" out="116"/> 
      <Period time="20:00:00" in="128" out="128"/> 
     </Movie> 
     <Movie name="movie3" in="454" out="454"> 
      <Period time="16:00:00" in="104" out="104"/> 
      <Period time="18:00:00" in="150" out="150"/> 
      <Period time="20:00:00" in="200" out="200"/> 
     </Movie> 
    <Day> 
</Cinema> 

什么我试图得到的是每天每部电影期间的游客总量。例如：

Thursday: 
16:00h - in: 90, out: 90 
18:00h - in: 180, out: 176 
20:00h - in: 273, out: 277 
Total - in: 543, out: 543 

Friday: 
16:00h - in: 299, out: 299 
18:00h - in: 397, out: 395 
20:00h - in: 455, out: 457 
Total - in: 1151, out: 1151 

有没有人有任何建议？提前致谢！

（我使用XSLT 1.0的时刻，但它有可能对我来说， “升级” 到较新的2.0，如果需要的话）

Answer 1

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> 
    <xsl:output omit-xml-declaration="yes" indent="yes"/> 

    <xsl:key name="k" match="Period" use="concat(../../@date, @time)"/> 

    <xsl:template match="/Cinema"> 
     <xsl:apply-templates select="Day"/> 
    </xsl:template> 

    <xsl:template match="Day"> 
     <xsl:value-of select="concat(@day, ':')"/> 
     <xsl:text>&#xA;</xsl:text> 

     <xsl:apply-templates select="*/Period[generate-id(.) = generate-id(key('k', concat(../../@date, @time)))]"/> 

     <xsl:value-of select="concat('Total - in: ', @in, ', out: ', @out)"/> 
     <xsl:text>&#xA;&#xA;</xsl:text> 
    </xsl:template> 

    <xsl:template match="Period"> 
     <xsl:value-of select=" 
         concat(substring(@time, 1, 5), 'h - in: ', 
         sum(key('k', concat(../../@date, @time))/@in), 
         ', out: ', 
         sum(key('k', concat(../../@date, @time))/@out))"/> 
     <xsl:text>&#xA;</xsl:text> 
    </xsl:template> 

</xsl:stylesheet> 

XML：

<Cinema> 
    <Day date="15-09-2011" day="Thursday" week="37" in="543" out="543"> 
     <Movie name="movie1" in="191" out="191"> 
      <Period time="16:00:00" in="20" out="20"/> 
      <Period time="18:00:00" in="71" out="70"/> 
      <Period time="20:00:00" in="100" out="101"/> 
     </Movie> 
     <Movie name="movie2" in="105" out="105"> 
      <Period time="16:00:00" in="13" out="13"/> 
      <Period time="18:00:00" in="34" out="34"/> 
      <Period time="20:00:00" in="58" out="58"/> 
     </Movie> 
     <Movie name="movie3" in="247" out="247"> 
      <Period time="16:00:00" in="57" out="57"/> 
      <Period time="18:00:00" in="75" out="72"/> 
      <Period time="20:00:00" in="115" out="118"/> 
     </Movie> 
    </Day> 
    <Day date="16-09-2011" day="Friday" week="37" in="1151" out="1151"> 
     <Movie name="movie1" in="364" out="364"> 
      <Period time="16:00:00" in="106" out="106"/> 
      <Period time="18:00:00" in="131" out="129"/> 
      <Period time="20:00:00" in="127" out="129"/> 
     </Movie> 
     <Movie name="movie2" in="333" out="333"> 
      <Period time="16:00:00" in="89" out="89"/> 
      <Period time="18:00:00" in="116" out="116"/> 
      <Period time="20:00:00" in="128" out="128"/> 
     </Movie> 
     <Movie name="movie3" in="454" out="454"> 
      <Period time="16:00:00" in="104" out="104"/> 
      <Period time="18:00:00" in="150" out="150"/> 
      <Period time="20:00:00" in="200" out="200"/> 
     </Movie> 
    </Day> 
</Cinema> 

输出：

Thursday: 
16:00h - in: 90, out: 90 
18:00h - in: 180, out: 176 
20:00h - in: 273, out: 277 
Total - in: 543, out: 543 

Friday: 
16:00h - in: 299, out: 299 
18:00h - in: 397, out: 395 
20:00h - in: 455, out: 457 
Total - in: 1151, out: 1151