TO retreive the tree structure

[Shilpa R. Kelkar]

I have following xml doc added to the collection products

<?xml version="1.0"?>
<product>
  <id>level1</id>
  <unit>
   <id>first</id>
        <lesson>
        <type>121</type>
           <frame>
           <type>1</type>
                <Picture>
                 <type>pct0101</type>
                </Picture>
                <sound>
                <type>snd0101</type>
                </sound>
                <text>
                <id>txt0101</id>
                </text>
           </frame>
          </lesson>

        <lesson>
        <type>141</type>
           <frame>
           <type>1</type>
                <Picture>
                 <type>pct0201</type>
                </Picture>
                <sound>
                <type>snd0201</type>
                </sound>
                <text>
                <id>txt0201</id>
                </text>
           </frame>
          </lesson>
     </unit>
  <unit>
   <id>second</id>
        <lesson>
        <type>221</type>
           <frame>
           <type>1</type>
                <Picture>
                 <type>pct0101</type>
                </Picture>
                <sound>
                <type>snd0101</type>
                </sound>
                <text>
                <id>txt0101</id>
                </text>
           </frame>
          </lesson>

        <lesson>
        <type>111</type>
           <frame>
           <type>1</type>
                <Picture>
                 <type>pct0201</type>
                </Picture>
                <sound>
                <type>snd0201</type>
                </sound>
                <text>
                <id>txt0201</id>
                </text>
           </frame>
          </lesson>
     </unit>
</product>

If I execute a query -q //[EMAIL PROTECTED]'txt0201']  , I will get the result 
as
<text> <id>txt0201</id></text>

How can I get the corresponding lesson type and unit id ??

Shilpa