xml - 在重复节点集中返回 "latest"节点

Question

我需要调整以下 XPath 表达式以返回“最新”Amend_Start_Date来自示例 XML(来自 MS InfoPath):

//my:Amend_Data[0=count(following-sibling::my:Amend_Data)]//my:Amend_Start_Date

和 XML:

<?xml version="1.0" encoding="UTF-8"?><?mso-infoPathSolution solutionVersion="1.0.0.440" productVersion="14.0.0" PIVersion="1.0.0.0" href="file:///C:\Documents%20and%20Settings\Chris\Local%20Settings\Application%20Data\Microsoft\InfoPath\Designer3\1c02663d7ed84d09\manifest.xsf" ?><?mso-application progid="InfoPath.Document" versionProgid="InfoPath.Document.2"?><?mso-infoPath-file-attachment-present?><my:myFields xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:dfs="http://schemas.microsoft.com/office/infopath/2003/dataFormSolution" xmlns:my="http://schemas.microsoft.com/office/infopath/2003/myXSD/2011-05-05T19:56:08" xmlns:xd="http://schemas.microsoft.com/office/infopath/2003" xml:lang="en-us">
<my:MasterSection>
    <my:Planning_Section>
        <my:Planned_Start_Date>2012-09-12</my:Planned_Start_Date>
        <my:Planned_End_Date>2012-09-14</my:Planned_End_Date>
    </my:Planning_Section>
    <my:Actual_Section>
        <my:Actual_Start_Date>2012-09-13</my:Actual_Start_Date>
        <my:Actual_End_Date>2012-09-15</my:Actual_End_Date>
    </my:Actual_Section>
    <my:Amend_Hider>
        <my:Amend_Info_Repeater_Group>
            <my:Amend_Info_Repeater>
                <my:Amend_Data>
                    <my:Amend_Start_Date>2012-09-16</my:Amend_Start_Date>
                    <my:Amend_End_Date>2012-09-21</my:Amend_End_Date>
                </my:Amend_Data>
            </my:Amend_Info_Repeater>
            <my:Amend_Info_Repeater>
                <my:Amend_Data>
                    <my:Amend_Start_Date>2012-09-23</my:Amend_Start_Date>
                    <my:Amend_End_Date>2012-09-27</my:Amend_End_Date>
                </my:Amend_Data>
            </my:Amend_Info_Repeater>
        </my:Amend_Info_Repeater_Group>
    </my:Amend_Hider>
</my:MasterSection>

我上周四开始使用 XPath ......如果我需要用勺子喂食，请原谅我。就目前而言，列出的表达式返回示例 XML 中的所有开始日期节点。它旨在返回“最新” Amend_Start_Date但不是因为 XML 的结构是这样的 Amend_Start_Date节点没有组合在一起。在此示例中，这意味着正确的表达式将返回 2012-09-23 的开始日期。和 不是 2012-09-16
一定有办法做到这一点!不知何故， Amend_Data 的相对路径节点必须修改...任何帮助表示赞赏!

PS:这与我周五发布的一个问题有关 can be found here .您可能会注意到该问题与此问题中列出的示例 XML 的结构差异。

Answer 1

这个:

(//my:Amend_Data)[last()]//my:Amend_Start_Date 

应该做的伎俩。

不使用 last()你可以试试:

//my:Amend_Info_Repeater[0=count(following-sibling::my:Amend_Info_Repeater)]/my:Amend_Data/my:Amend_Start_Date