Question

This flat XML represents tree structure using level field. How can I get elements that are deeper in the tree to the given node but only in the same branch?

So given that company name is A and I need to get company B and C (not E which is in different branch).

<Companies>
      <Company>
        <Name>A</Name>
        <Level>0</Level>
      </Company>
      <Company>
        <Name>B</Name>
        <Level>1</Level>
      </Company>
      <Company>
        <Name>C</Name>
        <Level>1</Level>
      </Company>
      <Company>
        <Name>D</Name>
        <Level>0</Level>
      </Company>
      <Company>
        <Name>E</Name>
        <Level>1</Level>
      </Company>
    </Companies>

There can be more than level one. I want it returned too.
I am using XLST 1.0.

Answer 1

Assume the focus node (current()) is the basis of your calculation.

Define…

<xsl:variable name="set1" select="following-sibling::Company[ Level &gt; current()]" />
<xsl:variable name="set2" select="following-sibling::Company[ Level &lt; 
      preceding-sibling::Company[1]/Level][1]/preceding-sibling::Company" />

Then the child companies are at the intersection of these two sets, which is…

$set1[. = $set2]