Re: [xsl] Another problem from Flat XML File to Hierarchical

[Abel Braaksma <abel.online@xxxxxxxxx>]

Hi Alex,

You didn't tell us what XSLT version you are using. I try with XSLT 2. 
Somehow I often have trouble with even rather flat to hierarchical 
questions. I am sure somebody else can do much better. The below 
solution works correctly if you add 'level1' to the top of your input 
xml. If you don't want that, you should adjust the patterns a bit:


<xsl:template match="/">
   <xsl:for-each-group
       select="$data/*"
       group-starting-with="level1">

       <xsl:copy>
           <xsl:apply-templates select="current-group()[2]" />
       </xsl:copy>
   </xsl:for-each-group>
</xsl:template>

<xsl:template match="*[matches(name(), 'level')]">
   <xsl:variable name="currentname" select="name()" />
   <xsl:for-each-group
       select="current-group()[position() > 1]"
       group-starting-with="*[name() = $currentname]">

       <xsl:copy>
           <xsl:apply-templates select="current-group()[2]" />
       </xsl:copy>
   </xsl:for-each-group>
</xsl:template>


It's a variant to the tree-traversal technique, as it always selects one 
higher than the current node.

Hope this helps,

Cheers,
-- Abel Braaksma
  http://xslt.metacarpus.com


alex v. wrote:
> I have a flat xml like this:
>
> <level2></level2>
> <level3></level3>
> <level2></level2>
> <level1></level1>
> <level2></level2>
> <level3></level3>
> <level3></level3>
>
> and I need to transform in a hierarchy structure like this using the
> tag name as key:
>
> <level2>
> <level3></level3>
> </level2>
> <level2></level2>
> <level1>
> <level2>
> <level3></level3>
> <level3></level3>
> </level2>
> </level1>
>
>
> Thanks in advance.
>
> ~av