Displaying XML hierarchy with XSL

Question

HI Gentlemen,
I have an XML subtree and an XSL stylesheet with the following cardinality:
[scheinarten_liste]
[scheinart]+
[scheinuntergruppen_liste]*
[scheinuntergruppe]+
Now, when the lower two elements are missing, then the pure hierarchical representation no longer feels well and delivers a mess. However, the <ul>..<li> representation is very stable and completely insensitive to missing elements. I tried this by playing fast and loose with the XML: commenting/uncommenting different parts of the it--it was always working correctly.
Below is a working code excerpt with solid balls in a single table cell.
The XML subtree:
    <scheinarten_liste V="1">                                                                                            
    <scheinart V="20" S="1.2.276.0.76.5.235" SV="1.03"> 
     <scheinuntergruppen_liste V="1">
       <scheinuntergruppe V="0101" S="1.2.276.0.76.3.1.1.5.1.19" SV="1.03"/>
       <scheinuntergruppe V="0102" S="1.2.276.0.76.3.1.1.5.1.19" SV="1.03"/>
       <scheinuntergruppe V="0103" S="1.2.276.0.76.3.1.1.5.1.19" SV="1.03"/>
       <scheinuntergruppe V="0104" S="1.2.276.0.76.3.1.1.5.1.19" SV="1.03"/>
     </scheinuntergruppen_liste>
      </scheinart>                                                       
      <scheinart V="42" S="1.2.276.0.76.5.235" SV="1.03"> 
     <scheinuntergruppen_liste V="1">
       <scheinuntergruppe V="23" S="1.2.276.0.76.3.1.1.5.1.19" SV="1.03"/>
       <scheinuntergruppe V="24" S="1.2.276.0.76.3.1.1.5.1.19" SV="1.03"/>
       <scheinuntergruppe V="26" S="1.2.276.0.76.3.1.1.5.1.19" SV="1.03"/>
     </scheinuntergruppen_liste>
      </scheinart>                                                         
    </scheinarten_liste>                                                                                            The XSL stylesheet (HTML body):
<table border="1">
<th>Scheinarten-Liste</th>
<tr>
<td>
<xsl:for-each select="pe:bedingung/pe:scheinarten_liste">
  <ul type="disc">
    <li><xsl:text>Listentyp: </xsl:text><xsl:value-of select="@V"/></li>
    <xsl:for-each select="pe:scheinart">
      <ul type="disc">
        <li><xsl:text>Scheinart: </xsl:text><xsl:value-of select="@V"/></li>
        <xsl:for-each select="pe:scheinuntergruppen_liste">
          <ul type="disc">
         <li><xsl:text>Typ der Untergruppen: </xsl:text><xsl:value-of select="@V"/></li>
            <xsl:for-each select="pe:scheinuntergruppe">
              <ul type="disc">
             <li><xsl:text>Untergruppe: </xsl:text><xsl:value-of select="@V"/></li>
              </ul>
            </xsl:for-each>
          </ul>
        </xsl:for-each>
      </ul>
    </xsl:for-each>
  </ul>
</xsl:for-each>
</td>
</tr>
</table>My question is: Does anybody know a solution to put the hierarchical levels into consecutive table cells with <tr>..<td>? I tried a lot of arrangements but I experienced that when re-executing a nested <xsl:for-each> loop, a new table cell was opened--erroneously.
With this in mind, I could then dismiss the solid balls and the nested list structure would look like normal nested <rowspan> output.
Thank you, kind regards
Miklos HERBOLY

Answer 1

You should be able to increase performance by caching Templates objects in memory as a previous post suggested.
Here is some untested code:public final class TransformerCache
     private static Map cache = new Vector();
     private TransformerCache(){}
     public static Transformer getTransformer( String filename )
          if( ! cache.containsKey( filename ) )
               TransformerFactory tf = TransformerFactory.newInstance();
               Templates template = tf.newTemplates( new StreamSource( filename ) );
               cache.put( filename, template );     
          return ( ( Templates ) cache.get( filename ) ).newTransformer();
}This aproach works in a clustered environment, just bear in ming that there will be an instance of the cache on each server instance (virtual machine).