Xml 在日期范围内对元素求和的xsl是什么？

xml摘录（完整的xml示例位于）：

2012-10-26T21:32:52
食物
10
2012-10-26T21:32:52
啤酒
20
2012-10-27T21:32:52
食物
10
2012-10-27T21:32:52
啤酒
20
2012-11-26T21:32:52
食物
11
2012-11-26T21:32:52
啤酒
22
2012-11-27T21:32:52
食物
11
2012-11-27T21:32:52
啤酒
22

所需输出：
2012-10食品20
2012-10啤酒40
2012-11食品22
2012-11啤酒44

---

还是xsl不简单，因为xml设计错误？

此转换：

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

 <xsl:key name="kEventByDateItem" match="event"
      use="concat(substring(when, 1,7), '+', what/item)"/>

 <xsl:template match=
  "event
     [generate-id()
     =
      generate-id(key('kEventByDateItem',
                       concat(substring(when, 1,7), '+', what/item)
                       )[1]
                  )
      ]">
     <xsl:value-of select="concat('&#xA;',substring(when, 1,7), ' ', what/item, ' ')"/>
     <xsl:value-of select=
      "sum(key('kEventByDateItem',
             concat(substring(when, 1,7), '+', what/item)
             )/what/money)"/>
 </xsl:template>
 <xsl:template match="text()"/>
</xsl:stylesheet>

<log>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>

  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>

</log>

说明：

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

 <xsl:key name="kEventByDateItem" match="event"
      use="concat(substring(when, 1,7), '+', what/item)"/>

 <xsl:template match=
  "event
     [generate-id()
     =
      generate-id(key('kEventByDateItem',
                       concat(substring(when, 1,7), '+', what/item)
                       )[1]
                  )
      ]">
     <xsl:value-of select="concat('&#xA;',substring(when, 1,7), ' ', what/item, ' ')"/>
     <xsl:value-of select=
      "sum(key('kEventByDateItem',
             concat(substring(when, 1,7), '+', what/item)
             )/what/money)"/>
 </xsl:template>
 <xsl:template match="text()"/>
</xsl:stylesheet>

<log>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>

  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>

</log>

---

使用复合键正确使用。

此转换：

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

 <xsl:key name="kEventByDateItem" match="event"
      use="concat(substring(when, 1,7), '+', what/item)"/>

 <xsl:template match=
  "event
     [generate-id()
     =
      generate-id(key('kEventByDateItem',
                       concat(substring(when, 1,7), '+', what/item)
                       )[1]
                  )
      ]">
     <xsl:value-of select="concat('&#xA;',substring(when, 1,7), ' ', what/item, ' ')"/>
     <xsl:value-of select=
      "sum(key('kEventByDateItem',
             concat(substring(when, 1,7), '+', what/item)
             )/what/money)"/>
 </xsl:template>
 <xsl:template match="text()"/>
</xsl:stylesheet>

<log>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>

  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>

</log>

说明：

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

 <xsl:key name="kEventByDateItem" match="event"
      use="concat(substring(when, 1,7), '+', what/item)"/>

 <xsl:template match=
  "event
     [generate-id()
     =
      generate-id(key('kEventByDateItem',
                       concat(substring(when, 1,7), '+', what/item)
                       )[1]
                  )
      ]">
     <xsl:value-of select="concat('&#xA;',substring(when, 1,7), ' ', what/item, ' ')"/>
     <xsl:value-of select=
      "sum(key('kEventByDateItem',
             concat(substring(when, 1,7), '+', what/item)
             )/what/money)"/>
 </xsl:template>
 <xsl:template match="text()"/>
</xsl:stylesheet>

<log>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>10</money>
    </what>
  </event>
  <event>
    <when>2012-10-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>20</money>
    </what>
  </event>

  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-26T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>food</item>
      <money>11</money>
    </what>
  </event>
  <event>
    <when>2012-11-27T21:32:52</when>
    <what>
      <item>beer</item>
      <money>22</money>
    </what>
  </event>

</log>

---

正确使用带有复合键的。

Dan，请不要让读者在“某处”使用XML。这次我帮你做了工作——把XML从目的地复制到它所属的正确位置——你的问题。迪米特，谢谢你的修复，我认为它太大了，不能发布。丹，不，它不太大。更重要的是，结构是统一的，因此无论大小，都很容易理解。为了获得问题的所有信息，读者必须看的地方越多越好。Dan，请不要让读者在“某处”使用XML。这次我帮你做了工作——把XML从目的地复制到它所属的正确位置——你的问题。迪米特，谢谢你的修复，我认为它太大了，不能发布。丹，不，它不太大。更重要的是，结构是统一的，因此无论大小，都很容易理解。为了获得问题的所有信息，读者必须看的地方越多越好。