| http://www.w3.org/ns/prov#value | - wherein R.sub.1, R.sub.2, R.sub.3, R.sub.12 and U are as described above; and N is an integer in the range of from about 1 to about 10,000 and preferably is in the range of from about 10 to about 1,000 and most preferably in the range of from
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