是否可以使用 XSLT 跳过层次结构中的某个级别? [英] Is it possible to skip a level in a Hierarchy using XSLT?

问题描述

层次结构采用 XML 格式，我使用 XSLT 来转换数据.

The Hierarchy is in XML format and I am using XSLT to transform the data.

例如:如果层次结构有 4 个级别，而我想跳过中间的一个级别(比如级别 3):

For eg : If the Hierarchy has 4 levels and I want to skip a level in between (say level 3) :

Level 1
    Level 2 
        Level 3 - Skip this level
            Level 4 
                Level 5 
            

我应该使用什么元素来实现相同的效果?

What element should I use to achieve the same?

附上我作为输入的示例 XML 文件以供参考

Attaching the sample XML file which I have as an input for reference

  <?xml version="1.0" encoding="UTF-8"?>
<Hierarchy>
    <Board>
        <Name>President</Name>
        <Id>ABCDE</Id>
        <ParentId></ParentId>
        <General>
            <Name>President</Name>
            <Description>Top level of the Hierarchy</Description>
            <Template>LEVEL1</Template>
        </General>
    </Board>
    <Board>
        <Name>VP</Name>
        <Id>EFGHI</Id>
        <ParentId>ABCDE</ParentId>
        <General>
            <Name>VP</Name>
            <Description>Below the President</Description>
            <Template>LEVEL2</Template>
        </General>
    </Board>
    <Board>
        <Name>Department_Heads</Name>
        <Id>JKLMN</Id>
        <ParentId>EFGHI</ParentId>
        <General>
            <Name>Department_Heads</Name>
            <Description>Reports to the VP</Description>
            <Template>LEVEL3</Template>
        </General>
    </Board>
    <Board>
        <Name>Supervisors</Name>
        <Id>OPQRS</Id>
        <ParentId>JKLMN</ParentId>
        <General>
            <Name>Supervisors</Name>
            <Description>Reports to the Reports to Dep Heads</Description>
            <Template>LEVEL4</Template>
        </General>
    </Board>
    <Board>
        <Name>Employees</Name>
        <Id>TUVWX</Id>
        <ParentId>OPQRS</ParentId>
        <General>
            <Name>Department_Heads</Name>
            <Description>Reports to the Reports to Dep Heads</Description>
            <Template>LEVEL5</Template>
        </General>
    </Board>
</Hierarchy>

更新:我正在添加预期的输出和我目前使用的 xslt 转换.

Update : I am adding the expected output and the xslt transformation i currently use.

预期输出如下:

我目前使用的转换如下:

The transformation I am currently using is as below :

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl">
    <xsl:output method="xml" indent="yes"/>
    <xsl:template match="/">
        <Hierarchy>
            <xsl:for-each select="Hierarchy/Board">

                <xsl:if test="General/Template='LEVEL1'">
                    <xsl:variable name="Presidentchild" select="Id"/>
                    <Board>
                        <Name>
                            <xsl:value-of select="Name"/>
                        </Name>
                        <Template>PRESIDENT</Template>
                        <Description>
                            <xsl:value-of select = "General/Description"/>
                        </Description>
                    </Board>
                </xsl:if>
            </xsl:for-each>
            <xsl:for-each select="//Board">
                <xsl:if test="ParentId = $Presidentchild">
                    <xsl:if test="General/Template='LEVEL2'">
                        <Board>
                            <xsl:variable name="VPchild" select="Id"/>
                            <Name>
                                <xsl:value-of select="Name"/>
                            </Name>
                            <Template>VICE_PRESIDENT</Template>
                            <Description>
                                <xsl:value-of select = "General/Description"/>
                            </Description>
                        </Board>
                    </xsl:if>
                </xsl:if>
            </xsl:for-each>
        </Hierarchy>
    </xsl:template>
</xsl:stylesheet>

........直到最后一个元素.

........so on till the last element.

预期的输出如下:

<?xml version="1.0" encoding="utf-8"?>
<Hierarchy>
  <Board>
    <Name>President</Name>
    <Template>PRESIDENT</Template>
    <Description>Top level of the Hierarchy</Description>
    <Board>
    <Name>VP</Name>
    <Template>VICE_PRESIDENT</Template>
    <Description>Below the President</Description>
    </Board>
   </Board>
</Hierachy>

... 直到最后一个元素.

... so on till the last element.

推荐答案

在对您的问题的评论中，我说这很琐碎.那是因为我认为您的输入 XML 具有层次结构.事实证明，需要通过跟踪从每个 Board 到其父级的交叉引用来派生层次结构.

In a comment to your question I said this is rather trivial. That is because I thought your input XML had a hierarchical structure. As it turns out, the hierarchy needs to be derived by tracing the cross-references from each Board to its parent.

不过，因为每个 Board 还包含一个(错误命名的)Template 元素，用于指示其在层次结构中的级别，因此很容易跳过"某些级别，例如以下样式表中的 LEVEL3:

Still, because each Board also includes a (misnamed) Template element that indicates its level in the hierarchy, it is easy to "skip" certain levels, such as LEVEL3 in the following stylesheet:

XSLT 1.0

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

<xsl:key name="children" match="Board" use="ParentId" />

<xsl:template match="/Hierarchy">
    <xsl:copy>
        <xsl:apply-templates select="Board[General/Template='LEVEL1']"/>
    </xsl:copy>
</xsl:template>

<xsl:template match="Board">
    <xsl:copy>
        <xsl:copy-of select="General/*"/>
        <xsl:apply-templates select="key('children', Id)"/>
    </xsl:copy>
</xsl:template>

<xsl:template match="Board[General/Template='LEVEL3']">
    <xsl:apply-templates select="key('children', Id)"/>
</xsl:template>

</xsl:stylesheet>

应用于您的输入示例，这将产生:

Applied to your input example, this will produce:

结果

<?xml version="1.0" encoding="UTF-8"?>
<Hierarchy>
  <Board>
    <Name>President</Name>
    <Description>Top level of the Hierarchy</Description>
    <Template>LEVEL1</Template>
    <Board>
      <Name>VP</Name>
      <Description>Below the President</Description>
      <Template>LEVEL2</Template>
      <Board>
        <Name>Supervisors</Name>
        <Description>Reports to the Reports to Dep Heads</Description>
        <Template>LEVEL4</Template>
        <Board>
          <Name>Department_Heads</Name>
          <Description>Reports to the Reports to Dep Heads</Description>
          <Template>LEVEL5</Template>
        </Board>
      </Board>
    </Board>
  </Board>
</Hierarchy>

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