Need Help in Creating folder tree(html) from xtm document using xslt

HI everyone,
     I need help in creating a folder tree from an xtm document using xslt.

My xtm document is like this.

<?xml version="1.0" encoding="ISO-8859-1" ?>
<topicMap xmlns="http://www.topicmaps.org/xtm/1.0/"; 
xmlns:xlink="http://www.w3.org/1999/xlink"; id="xtm of the ecosystem">
<!-- ..................... THE TOPIC MAP TOPIC ..................... -->
<topic id="ecosystem-xtm-topic">
        <subjectIdentity>
                <subjectIndicatorRef xlink:href="#xtm of the ecosystem" />
        </subjectIdentity>
        <baseName>
                <baseNameString>
                        topic map for the ecosystem
                </baseNameString>
        </baseName>
</topic>

<!-- ..................... FIRST LEVEL TOPIC TYPES ..................... -->
<topic id="ecosystem">
        <baseName>
                <baseNameString>
                        Ecosystem
                </baseNameString>
        </baseName>
</topic>

<topic id="food chain">
        <baseName>
                <baseNameString>
                        food chain
                </baseNameString>
        </baseName>
</topic>

<topic id="living part">
        <baseName>
                <baseNameString>
                        Living part
                </baseNameString>
        </baseName>
</topic>

<topic id="non-living part">
        <baseName>
                <baseNameString>
                        Non-Living Part
                </baseNameString>
        </baseName>
</topic>

<!-- ..................... SECOND LEVEL TOPIC TYPES ..................... 
-->
<topic id="animal">
        <instanceOf>
                <topicRef xlink:href="#living part" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        animal
                </baseNameString>
        </baseName>
</topic>

<topic id="frog-hawk food chain">
        <instanceOf>
                <topicRef xlink:href="#food chain" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        frog-hawk food chain
                </baseNameString>
        </baseName>
</topic>

<topic id="plant">
        <instanceOf>
                <topicRef xlink:href="#living part" />
                </instanceOf>
                <baseName>
                        <baseNameString>
                                plant
                        </baseNameString>
                </baseName>
</topic>

<topic id="air">
        <instanceOf>
                <topicRef xlink:href="#non-living part" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        air
                </baseNameString>
        </baseName>
</topic>

<topic id="water">
        <instanceOf>
                <topicRef xlink:href="#non-living part" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        water
                </baseNameString>
        </baseName>
</topic>

<topic id="soil">
        <instanceOf>
                <topicRef xlink:href="#non-living part" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        soil
                </baseNameString>
        </baseName>
</topic>

<!-- ..................... THIRD LEVEL TOPICS ..................... -->
<topic id="animal-carnivore">
        <instanceOf>
                <topicRef xlink:href="#animal" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        animal-carnivore
                </baseNameString>
        </baseName>
</topic>

<topic id="plant-carnivore">
        <instanceOf>
                <topicRef xlink:href="#plant" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        plant-carnivore
                </baseNameString>
        </baseName>
</topic>

<topic id="animal-herbivore">
        <instanceOf>
                <topicRef xlink:href="#animal" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        animal-herbivore
                </baseNameString>
        </baseName>
</topic>

<topic id="plant-herbivore">
        <instanceOf>
                <topicRef xlink:href="#plant" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        plant-herbivore
                </baseNameString>
        </baseName>
</topic>

<topic id="bird">
        <instanceOf>
                <topicRef xlink:href="#animal" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        bird
                </baseNameString>
        </baseName>
</topic>

<topic id="reptile">
        <instanceOf>
                <topicRef xlink:href="#animal" />
        </instanceOf>
        <baseName>
                <baseNameString>
                        reptile
                </baseNameString>
        </baseName>
</topic>

-------------------------------------------
I need the HTML output as

topic map for the ecosystem
  EcoSystem
  Food Chain
     frog-hawk food chain
  Living Part
     Animal
        animal-carnivore
        animal-herbivore
        bird
        reptile
     Plant
        plant-carnivore
        plant-herbivore

  Non-Living part
     Air
     water
     soil



Any Idea about how to do it.  It would be much helpful.

thanks a lot.

Regards,
Vel

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