Need Help in Creating folder tree(html) from xtm docum

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

<!-- ..................... 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>

<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

Regards,
Vel