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- imp_authority: the authority key if any for this value. Since 40eeb989c4354731c0ee3fce6e80d6df64b80c94 the authority and confidence values are used by default as is forcing the metadata creation to skip the getBestMatch method of the authority framework. To guess a potential match it is possible to use the value, case insensitive, [GUESS], to force the use of the authority framework getBestMatch method.
- imp_confidence: the confidence of the authority if any (600 mean accepted match)
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- embargo_start_date: to use as start date of Anonymous READ policy when embargo_policy = 1
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