Selection of an XML-Tree will not work

Hi, 

I have confused Problem with XPath.
Im trying to create a XPath statement to select a subsection of an XML-Tree.
Please let me you give first a example of the tree.

<tree>
  <entry id="1">
    <entry id="A">
  <entry/>  
  <entry id="2">
    <entry id="B">
      <entry id="I"/>
    <entry/>
    <entry id="C">
      <entry id="J"/>
    <entry/>
  <entry/>
  <entry id="3">
    <entry id="D">
  <entry/>
</tree>

Ok fine - thats the tree. And now let me describe how I would select the
tree.
My wish is it - I would say give me all ancestor and from one of the
anscestors element all childs. I give you now a little example.

When I say select me the Tree for ID="I" it should me select the following
tree.

<tree>
  <entry id="1"/>
  <entry id="2">
    <entry id="B">
      <entry id="I"/>
    <entry/>
    <entry id="C"/>
  <entry/>
  <entry id="3"/>
</tree>

You see - it selects all elements from depth=1, but no subelement from
id="1" and id="3", and in depth=2, only subelements from id="B", but no
subelements from id="C".

Ok this is what I want - and I have also a code that worked, here is the
code example:

  <xsl:template match="tree">
    <xsl:for-each select="//*">
      <xsl:if test="$navid=string(@id)">
        <xsl:if test="boolean(@title)">
          <xsl:variable name="subid">
            <xsl:number level="multiple" format="A."/>
          </xsl:variable>  
          <xsl:for-each select="//*">
            <xsl:variable name="curid">
              <xsl:number level="multiple" format="A."/>
            </xsl:variable>
            <xsl:variable name="curid">
              <xsl:value-of
select="substring($curid,0,string-length($curid)-1)"/>
            </xsl:variable>
            <xsl:if test="starts-with($subid,$curid)">
              <xsl:value-of select="@id"/><br/>
            </xsl:if>
          </xsl:for-each>
        </xsl:if>
      </xsl:if>
    </xsl:for-each>
  </xsl:template> 

$navid is a variable who is set the ID what should selected.
This code worked fine but I hope you can tell me how I can select the same
Path with XPath.

 - Conny -


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