| http://www.w3.org/ns/prov#value | - Z1 and Z2 are the same or different and represent, a bridging group, such as an alkylene, an arylene, or an arylalkylene, suitable examples of which include methylene, 1,2-ethylene, 1,3-propylene, 1,4-butylene, 1,5-pentylene, 1,6-hexylene, 1,4-phenylene, 4,4???-biphenyl, and the like.
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