How can I do a string substitution for turning entitie

I am not sure if the subject line conveyed it, but I am not really sure
how to describe it at this point.

Here is an example of my xml data

<text>
   &lt;p&gt;Sometext here. Followed by more text&lt;/p&gt;
   &lt;p&gt;More text.&lt;/p&gt;
   &lt;li&gt;For more info see &lt;/li&gt;
</text>

Because of the way the program that generates it is handling it, the
html markup tags are converted to the entities for < and >.  In my XSL I
need to change them back to the specific markup tags.

What is the best way to go about this?  

Any advice or examples would be fantastic and much appreciated

Bill


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