[xsl] replacing diacritical marks with combining unicode characters

I have input with many dictionary entries, including copy such as  
this edited pronunciation key:
<div class="story">
        <p>PARTIAL PRONUNCIATION KEY</p>
        <p>a˘ pat, a¯ pay, âr care, ä father, e˘ pet, e¯ bee </p>
</div>

I need to replace the non-combining characters such as the breve ˘  
(&#728;) with the combining form: (&#774;). Is there a way to set up  
a table so that when the processor encounters the &#728; character it  
will swap it for the &#774;? Will an ENTITY listing work? Is so,  
where does one put such an entity listing?
Terry



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