Django Atom feed Item Category

Hi everyone,
I'm geting a little confused with the 'item category' section of
Django's atom feed framework. I want to extend each entry in a feed
with a further piece of information beyond the standard title, id,
etc. The only way I see how to do this is to make use of the
'category' element (correct me if I shoudn't be doing things in this
way). For example I want to tag each entry with say
'institution' (without going down the path of breaking out into
seperate feeds for each institution). So I'm hoping for a feed along
the lines of:

<feed>
<id>xxxxxxxxxxxxxxxxx</id>
<title>xxxxxxxxxxxxxx</title>
<subtitle>xxxxxxxxxxxxxxxxxxxxx</subtitle>
<updated>xxxxxxx</updated>
..................
...................

<entry>
<id>urn:uuid:354ed4ec-e346-11df-9343-00163e9152a5</id>
<title>xxxxxxxxxxxxxxxxxxxxxxxxx</title>
<updated>xxxxxxxxxxxxxxxx</updated>
.........................
.........................
<category term="Institution"> My_Institution </category>
</entry>

At the moment I have the following in my feed class:

def item_categories(self,item):
return [{'term':'Insitution'}]

which generates the element with the attribute correctly. But how do I
get the value embedded, i.e. the 'My_Institution'?

Any help or even advice if I'm using atom feed wrongly here would be
much appreciated.

Thanks,
G

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