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Is it possible to output an orderby string returning a list of entry_id for a specific category?

I'm building an XML Feed for a flash website and need to basically parse out a list (presumably pipe separated entry_id's) for each category of a channel.

So for example:

channel = furniture

cat1 = seating [entries: 1,2,3,4]
cat2 = storage [entries: 5,6,7]

I'd need some way of outputting {order_field_name:cat1} to only get for example "1|2|3|4" for the entry_ids of entries matching the channel and category.

Is that possible somehow?
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