xpath - Xpath，在其他两个节点之间查找节点

Question

我需要构造一个通用XPath来找到正确的节点，其中的标准是日期和时间。例如查找“ 5 May”，“ 12:17:44”的节点

XML具有日期和时间标签。
不方便地，日期标签仅在当天的第一次出现时填充。 （始终填充时间标签）

我已经试过了：

/itemisationTable/row[@Date="03 May"]/following-sibling::row[@Time="12:17:44"]

它工作正常，但不正确，因为这

/itemisationTable/row[@Date="03 May"]/following-sibling::row[@Time="21:12:06"]

还可以找到结果，但不可以。



我的另一个问题是

/itemisationTable/row[@Date="03 May"]/following-sibling::row[@Time="09:34:13"]

应该找到一个节点，但是找不到。



如果有人可以通过XPath帮助我，我将不胜感激，因为它超出了我的Xpath技能。

这是XML的片段

<itemisationTable index="1" name="Belgium - SMS/Data" total="1.522">
<row Date="03 May" Time="09:34:13" Number="xphone.com" Description="Roaming Data" Origin="Belgium" Destination="Other Provider" InBundle="" Taxable="T" Duration="12.57 MB" Cost_exc_VAT="1.258" />
<row Date="" Time="10:43:41" Number="4428" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="10:43:44" Number="4428" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="12:17:44" Number="4408" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="21:10:50" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="21:11:55" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="04 May" Time="21:12:06" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="21:22:34" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="21:23:23" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="21:23:31" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="05 May" Time="21:23:56" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="21:30:45" Number="4412" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="22:24:35" Number="4431" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="" Time="22:24:38" Number="4431" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
<row Date="06 May" Time="" Number="xphone.com" Description="Roaming Data" Origin="Belgium" Destination="Other Provider" InBundle="" Taxable="T" Duration="2.59 MB" Cost_exc_VAT="0.264" />
<row Date="" Time="07:09:15" Number="4483" Description="xphone SMS" Origin="Belgium" Destination="UK" InBundle="B" Taxable="" Duration="1" Cost_exc_VAT="0.000" />
</itemisationTable>

Answer 1

整rick这并不是特别有效，但是它是一个可行的解决方案（使用XPath 2.0）：

/itemisationTable
  /row[@Date=$date]
  /(self::row | following-sibling::row[
    not(./preceding-sibling::row[@Date != ""][1]/@Date != $date)
  ][not(./@Date != "" and ./@Date != $date)])[@Time=$time]

使用XPath 1.0，这变得更加麻烦：

/itemisationTable
  /row[@Date=$date]
  /following-sibling::row[
    not(./preceding-sibling::row[@Date != ""][1]/@Date != $date)
  ][not(./@Date != "" and ./@Date != $date)][@Time=$time]
| /itemisationTable/row[@Date=$date][not(./@Date != "" and ./@Date !=$date][@Time=$time]

通过XPath引擎设置 $date和 $time-例如，在XMLStarlet中，这将是 --var date='"03 May"'；用 declare variable $date="03 May"在XQuery引擎中评估XPath；等等

重要的是使用 preceding-sibling回溯并查看您是否越过边界，排除所有确实存在的节点。

对于具有足够表达能力以构建有效解决方案的语言，我想切换到XQuery。



为了允许复制/粘贴测试，以下内容已在 http://www.freeformatter.com/xpath-tester.html上成功使用：

/itemisationTable   /row[@Date="03 May"]   /following-sibling::row[     not(./preceding-sibling::row[@Date != ""][1]/@Date != "03 May")   ][not(./@Date != "" and ./@Date != "03 May")][@Time="21:11:55"] | /itemisationTable/row[@Date="03 May"][not(./@Date != "" and ./@Date != "03 May")][@Time="21:11:55"]