It’s the opposite of a nonrestrictive clause, which can be chopped right out of the sentence while leaving the noun just as specific and the main clause just as logical and sound.

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NEW ORLEANS — Adults undergoing stem cell transplant who received a nonrestrictive diet had similar rates of infection, feeding outcomes and acute graft-versus-host disease as those on a low ...

Nonrestrictive global trade key to poverty alleviationAs fears of a trade war challenge global economic growth over the next few years, the World Bank dispatched a clear message – trade is ...

Nigel Fabb, The Difference between English Restrictive and Nonrestrictive Relative Clauses, Journal of Linguistics, Vol. 26, No. 1 (Mar., 1990), pp. 57-77 ...