XSLT从子节点创建父节点的副本

Question

I'm working with XSLT and I have a requirement that I'm not sure how to proceed with.

I've included images below as the scenario is a bit difficult to explain.

Before : There is 1 tree node and there are 2 leaf nodes in each of the nodes.

After : There are 2 tree nodes. The 1st tree holds the first leaf nodes under leaves and the 2nd tree holds the second leaf nodes under leaves.

Before XML Image

After XML Image

I'm unsure if I should go outwards in, tree -> leaf or inwards out, leaf -> tree in my template matching..

Thank you for any help!

Update:

Before XML as Text

<?xml version="1.0" encoding="UTF-8"?>
<tree uId="0">
  <branches uId="1">
    <branch uId="2">
      <branchId uId="3">0988890098887656</branchId>
      <number uId="4">7</number>
      <leaves uId="5">
        <leaf uId="6">
          <name uId="7">Leaf 1</name>
        </leaf>
        <leaf uId="8">
          <name uId="9">Leaf 2</name>
        </leaf>
      </leaves>
      <bugs uId="10">10</bugs>
    </branch>
    <branch uId="11">
      <branchId uId="12">66677755564446</branchId>
      <number uId="13" />
      <leaves uId="14">
        <leaf uId="15">
          <name uId="16">Leaf 1</name>
        </leaf>
        <leaf uId="17">
          <name uId="18">Leaf 2</name>
        </leaf>
      </leaves>
      <bugs uId="19" />
    </branch>
  </branches>
  <title uId="20">Great Tree</title>
</tree>

After XML as Text:

<tree uId="0">
  <branches uId="1">
    <branch uId="2">
      <branchId uId="3">0988890098887656</branchId>
      <number uId="4">7</number>
      <leaves uId="5">
        <leaf uId="6">
          <name uId="7">Leaf 1</name>
        </leaf>
      </leaves>
      <bugs uId="10">10</bugs>
    </branch>
    <branch uId="11">
      <branchId uId="12">66677755564446</branchId>
      <number uId="13" />
      <leaves uId="14">
        <leaf uId="15">
          <name uId="16">Leaf 1</name>
        </leaf>
      </leaves>
      <bugs uId="19" />
    </branch>
  </branches>
  <title uId="20">Great Tree</title>
</tree>
<tree>
  <branches>
    <branch>
      <branchId>0988890098887656</branchId>
      <number>7</number>
      <leaves>
        <leaf uId="8">
          <name uId="9">Leaf 2</name>
        </leaf>
      </leaves>
      <bugs>10</bugs>
    </branch>
    <branch>
      <branchId>66677755564446</branchId>
      <number/>
      <leaves>
        <leaf uId="17">
          <name uId="18">Leaf 2</name>
        </leaf>
      </leaves>
      <bugs />
    </branch>
  </branches>
  <title>Great Tree</title>
</tree>

XSLT:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:exsl="http://exslt.org/common"
    exclude-result-prefixes="xs"
    version="1.0">

    <xsl:template match="tree">
        <xsl:variable name="copies">
            <xsl:call-template name="getTreeCopies" />
        </xsl:variable>

        <xsl:copy-of select="exsl:node-set($copies)/*"/>

    </xsl:template>

    <xsl:template name="getTreeCopies">
        <xsl:variable name="countOfLeaf" select="count((.//leaves)[1]/leaf)" />
        <xsl:call-template name="getTreeCopy">
            <xsl:with-param name="i">1</xsl:with-param>
            <xsl:with-param name="count">
                <xsl:value-of select="$countOfLeaf" />
            </xsl:with-param>
        </xsl:call-template>
    </xsl:template>

    <xsl:template name="getTreeCopy">
        <xsl:param name="i" />
        <xsl:param name="count" />

        <xsl:if test="$i &lt;= $count">
            <xsl:copy-of select="."/>
            <xsl:call-template name="getTreeCopy" >
                <xsl:with-param name="i">
                    <xsl:value-of select="$i + 1"/>
                </xsl:with-param>
                <xsl:with-param name="count">
                    <xsl:value-of select="$count"/>
                </xsl:with-param>
            </xsl:call-template>
        </xsl:if>
    </xsl:template>
</xsl:stylesheet>

My XSLT so far copies the tree node (number of leaf nodes in leaves node per branch) times. The next step would be to remove leaf at position 1 from tree 1 and leaf at position 2 from tree 2... etc and then remove the uid attributes from any copies of the original tree.

Answer 1

An alternative way would be to:

• Create a key of leaf 's based on their position.
• Process the first leaf for each key. ( Muenchian Grouping )
• The first leaf in a key triggers processing of the ancestor tree (and its descendants).
• A list of generated ID's for all of the leaf 's in the key are passed as a parameter. (Since XSLT 1.0 doesn't support tunneling, it will need to be passed in each apply-templates call.)
• When the leaves element is processed, only leaf elements with a matching generated ID are processed.
• The use of mode 's can control whether or not attributes are processed.

Example (also demonstrated here: http://xsltfiddle.liberty-development.net/6qM2e2a )...

XML Input

<tree uId="0">
    <branches uId="1">
        <branch uId="2">
            <branchId uId="3">0988890098887656</branchId>
            <number uId="4">7</number>
            <leaves uId="5">
                <leaf uId="6">
                    <name uId="7">Leaf 1</name>
                </leaf>
                <leaf uId="8">
                    <name uId="9">Leaf 2</name>
                </leaf>
            </leaves>
            <bugs uId="10">10</bugs>
        </branch>
        <branch uId="11">
            <branchId uId="12">66677755564446</branchId>
            <number uId="13" />
            <leaves uId="14">
                <leaf uId="15">
                    <name uId="16">Leaf 1</name>
                </leaf>
                <leaf uId="17">
                    <name uId="18">Leaf 2</name>
                </leaf>
            </leaves>
            <bugs uId="19" />
        </branch>
    </branches>
    <title uId="20">Great Tree</title>
</tree>

XSLT 1.0

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output indent="yes"/>
  <xsl:strip-space elements="*"/>

  <xsl:key name="leaves" match="leaf" use="count(preceding-sibling::leaf) + 1"/>

  <xsl:template match="/">
    <xsl:apply-templates select="//leaf[count(.|key('leaves',count(preceding-sibling::leaf) + 1)[1])=1]"/>
  </xsl:template>

  <xsl:template match="@*|node()" mode="full">
    <xsl:param name="leafId"/>
    <xsl:copy>
      <xsl:apply-templates select="@*|node()" mode="full">
        <xsl:with-param name="leafId" select="$leafId"/>
      </xsl:apply-templates>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="@*|node()" mode="partial">
    <xsl:param name="leafId"/>
    <xsl:copy>
      <xsl:apply-templates select="node()" mode="partial">
        <xsl:with-param name="leafId" select="$leafId"/>
      </xsl:apply-templates>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="leaves" mode="full">
    <xsl:param name="leafId"/>
    <xsl:copy>
      <xsl:apply-templates select="@*|leaf[contains($leafId,concat('|',generate-id()))]" mode="full"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="leaves" mode="partial">
    <xsl:param name="leafId"/>
    <xsl:copy>
      <xsl:apply-templates select="leaf[contains($leafId,concat('|',generate-id()))]" mode="full"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="leaf">
    <xsl:variable name="leafId">
      <xsl:for-each select="key('leaves',count(preceding-sibling::leaf)+1)">
        <xsl:value-of select="concat('|',generate-id())"/>
      </xsl:for-each>
    </xsl:variable>
    <xsl:choose>
      <xsl:when test="position() = 1">
        <xsl:apply-templates select="ancestor::tree" mode="full">
          <xsl:with-param name="leafId" select="$leafId"/>
        </xsl:apply-templates>
      </xsl:when>
      <xsl:otherwise>
        <xsl:apply-templates select="ancestor::tree" mode="partial">
          <xsl:with-param name="leafId" select="$leafId"/>
        </xsl:apply-templates>        
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

</xsl:stylesheet>

Output

<tree uId="0">
   <branches uId="1">
      <branch uId="2">
         <branchId uId="3">0988890098887656</branchId>
         <number uId="4">7</number>
         <leaves uId="5">
            <leaf uId="6">
               <name uId="7">Leaf 1</name>
            </leaf>
         </leaves>
         <bugs uId="10">10</bugs>
      </branch>
      <branch uId="11">
         <branchId uId="12">66677755564446</branchId>
         <number uId="13"/>
         <leaves uId="14">
            <leaf uId="15">
               <name uId="16">Leaf 1</name>
            </leaf>
         </leaves>
         <bugs uId="19"/>
      </branch>
   </branches>
   <title uId="20">Great Tree</title>
</tree>
<tree>
   <branches>
      <branch>
         <branchId>0988890098887656</branchId>
         <number>7</number>
         <leaves>
            <leaf uId="8">
               <name uId="9">Leaf 2</name>
            </leaf>
         </leaves>
         <bugs>10</bugs>
      </branch>
      <branch>
         <branchId>66677755564446</branchId>
         <number/>
         <leaves>
            <leaf uId="17">
               <name uId="18">Leaf 2</name>
            </leaf>
         </leaves>
         <bugs/>
      </branch>
   </branches>
   <title>Great Tree</title>
</tree>