xpath - XPath，根据中的相关节点进行过滤

Question

我已经阅读了我能找到的所有内容，但还没有找到让它工作的方法。我正在尝试根据节点或其父节点的值从特定节点查询总和。一些节点可能满足具有正确名称的基本要求，但它们的父节点可能不满足，所以我需要忽略这些。在 SQL 术语中，我会使用 EXISTS 或 LIKE 子句来解决这个问题。

我想做的是

   SUM    ServiceAmounts 
   FROM   ChargeData elements 
   WHERE  ChargeDescription = 'subTotal-DistrubutionCharges' 
          AND Detail.ServiceType = 'electric' 
          AND NOT 
          (
              ChargeData has a sibling with ChargeDescription = 'Leased Outdoor Lighting' - the entire detail node should be ignored that contains the ChargeData element with 'Leased Outdoor Lighting'. 
          ) 

如果有价值的话，我的 XSL 版本是 1.0。

源 XML：

    <Source>
      <Detail>
        <ServiceType>electric</ServiceType>
        <Charges>
           <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>19.8</ServiceAmount>
            <ChargeDescription>7% Sales Tax</ChargeDescription>
            <ChargeID>sales_tax</ChargeID>
          </ChargeData>
          <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>282.8</ServiceAmount>
            <ChargeDescription>E-2 Demand</ChargeDescription>
            <ChargeID>usage_charge</ChargeID>
          </ChargeData>
          <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>165.91</ServiceAmount>
            <ChargeDescription>7% Sales Tax</ChargeDescription>
            <ChargeID>sales_tax</ChargeID>
          </ChargeData>
          <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>2370.15</ServiceAmount>
            <ChargeDescription>E-2 Commercial</ChargeDescription>
            <ChargeID>usage_charge</ChargeID>
          </ChargeData>
          <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>2838.66</ServiceAmount>
            <Quantity>0</Quantity>
            <ChargeDescription>subTotal-DistributionCharges</ChargeDescription>
          </ChargeData>
        </Charges>
      </Detail>
      <Detail>
        <ServiceType>electric</ServiceType>
        <Charges>
          <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>2.57</ServiceAmount>
            <ChargeDescription>7% Sales Tax</ChargeDescription>
            <ChargeID>sales_tax</ChargeID>
          </ChargeData>
          <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>36.8</ServiceAmount>
            <ChargeDescription>Leased Outdoor Lighting</ChargeDescription>
            <ChargeID>usage_charge</ChargeID>
          </ChargeData>
          <ChargeData>
            <AllowanceChargeInd>C</AllowanceChargeInd>
            <ServiceAmount>39.37</ServiceAmount>
            <Quantity>0</Quantity>
            <ChargeDescription>subTotal-DistributionCharges</ChargeDescription>
          </ChargeData>
        </Charges>
      </Detail>
    </Source>

我的 xsl，好吧，我已经尝试了多次并一直陷入死胡同：

    sum(//ChargeData[not(contains(ChargeDescription,'Leased Outdoor Lighting')) 
    and not(contains(Detail/Charges/ChargeData/ChargeDescription, 'subTotal'))  
    and ancestor::Detail/ServiceType='electric']/ServiceAmount) 

或者

    sum(//ChargeData[contains(ChargeDescription, 'subTotal-DistributionCharges') 
    and ancestor::Detail/ServiceType='electric']/ServiceAmount)
    -
    sum(//ChargeData[contains(ChargeDescription, 'Leased Outdoor Lighting') 
    and ancestor::Detail/ServiceType='electric']/ServiceAmount)

也许这是不可能的。我不能做的一件事是更改架构/数据结构。

Answer 1

我对您的要求有点困惑，并且您的样本标签不匹配（<Source> </Bill>）

这将选择您的样本中我认为符合您的条件的单个 ChargeData 元素

Detail
 [ServiceType="electric"]
 [not(Charges/ChargeData/ChargeDescription[.="Leased Outdoor Lighting"])]
 /Charges/ChargeData[ChargeDescription="subTotal-DistributionCharges"]

解释

• Detail
  选择详细子元素
• [ServiceType="electric"]
  仅选择具有值为“electric”的子 ServiceType 元素的 Detail 元素
• [not(Charges/ChargeData/ChargeDescription[.="Leased Outdoor Lighting"])]
  排除提供了匹配排除字符串的后代 ChargeDescription 的 Detail 元素
• /Charges/ChargeData[ChargeDescription="subTotal-DistributionCharges"]
  在过滤后的 Detail 元素下方，选择 ChargeData，其中提供了一个子 ChargeDescription 匹配字符串

所以

sum(
 Detail
 [ServiceType="electric"]
 [not(Charges/ChargeData/ChargeDescription[.="Leased Outdoor Lighting"])]
 /Charges/ChargeData[ChargeDescription="subTotal-DistributionCharges"]/ServiceAmount
)

产量

2838.6599999999999