Fixing entities

I'm trying to tidy up some xml that contains html entities such as named
&fract12; and number ½

I wish to map them to <character code="fract12" /> and <character code="189"
/> (I will then use a utf mapping file to map them to utf codes)

Whats the correct way to do this is xslt - the classic example would be
"<p>john gave &fract12; the cake to jane</p>"

Thanks in advance.


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