Can I find out the names of elements in a tree?

If yes then can some on help me find out how?
suppose the exml doc looks like the following
<root>
 <first>
  <second>
    <third>
      <and-so-on>
      </and-so-on> 
    </third>
  </second>
 </first>
</root>

<xsl:template match = "root">
 and in here I want to find out the names of all the nodes in a display able
manner i.e one name on each line or something

</xsl:template

Thanks

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