Relink the parentID of the child of skipped element - xslt

Question

I want to change the ParentId of the child of the skipped element using xslt. My input file :
<?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>Employees</Name>
<Description>Reports to the Reports to Dep Heads</Description>
<Template>LEVEL5</Template>
</General>
</Board>
</Hierarchy>
Expected Output file :
<?xml version="1.0" encoding="UTF-8"?>
<Hierarchy>
<Board>
<Name>President</Name>
<Description>Top level of the Hierarchy</Description>
<Template>LEVEL1</Template>
<Id>ABCDE</Id>
<ParentId></ParentId>
<Board>
<Name>VP</Name>
<Description>Below the President</Description>
<Template>LEVEL2</Template>
<Id>EFGHI</Id>
<ParentId>ABCDE</ParentId>
<Board>
<Name>Supervisors</Name>
<Description>Reports to the Reports to Dep Heads</Description>
<Template>LEVEL4</Template>
<Id>OPQRS</Id>
<ParentId>EFGHI</ParentId>
<Board>
<Name>Employees</Name>
<Description>Reports to the Reports to Dep Heads</Description>
<Template>LEVEL5</Template>
<Id>TUVWX</Id>
<ParentId>OPQRS</ParentId>
</Board>
</Board>
</Board>
</Board>
</Hierarchy>
Now with the help of another question i raised, I am able to find a way to skip elements. Question link below :
Is it possible to skip a level in a Hierarchy using XSLT?
But If you observe in the expected output, The ParentId of Supervisors is changed to the Id of VP, thus skipping the element "Depeartment Heads" altogether. Is this possible? Can someone give a possible solution to this? Thanks in advance.

Answer 1

I don't see why you need the Board elements to continue to carry their parent's Id, after you have changed the structure to a proper hierarchical one.
Anyone receiving a result in the following format:
<Hierarchy>
<Board>
<Name>President</Name>
<Description>Top level of the Hierarchy</Description>
<Template>LEVEL1</Template>
<Id>ABCDE</Id>
<Board>
<Name>VP</Name>
<Description>Below the President</Description>
<Template>LEVEL2</Template>
<Id>EFGHI</Id>
<Board>
<Name>Supervisors</Name>
<Description>Reports to the Reports to Dep Heads</Description>
<Template>LEVEL4</Template>
<Id>OPQRS</Id>
<Board>
<Name>Employees</Name>
<Description>Reports to the Reports to Dep Heads</Description>
<Template>LEVEL5</Template>
<Id>TUVWX</Id>
</Board>
</Board>
</Board>
</Board>
</Hierarchy>
can easily see that the parent of the Board named Supervisors is the Board named VP, and its Id value of EFGHI is readily available using the expression parent::Id. Duplicating this value in a separate ParentId element is utterly redundant.
Still, if you want this unnecessary complication, you could do:
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:param name="parentId" select="ParentId"/>
<xsl:copy>
<xsl:copy-of select="General/*"/>
<xsl:copy-of select="Id"/>
<ParentId>
<xsl:value-of select="$parentId"/>
</ParentId>
<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:with-param name="parentId" select="ParentId"/>
</xsl:apply-templates>
</xsl:template>
</xsl:stylesheet>
Note that this assumes you won't be skipping two or more consecutive levels.