| http://www.w3.org/ns/prov#value | - The next layer of cover 300 can be structural layer 304, which can also be substantially transparent and formed from a plastic such as polymethyl methacrylate (PMMA), polycarbonate (PC), and the like, although other materials can be used, such as glass, PET, PCTA, PCTG, PMP, PS, FEP, CA Butyrate, PVC, PPO/PS, ASA, Acryonitrile, PMMA/P, SAN, cyclic olefin co-polymer (COC), and sapphire crystal, all
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