You have a good point here, but your examples fail to make it clear. As you say yourself, foaf:interest is defined to point to a ''web page about the interest'', not to the interest iteself. This means the problem you're trying to show doesn't exist in the case of foaf:interest, and it makes your last two examples bogus. You should have used foaf:topic_interest instead. The problem, though, is real for many cases.
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