| http://www.w3.org/ns/prov#value | - Suitable materials for covering the orifice 20 include, for example, polymers such as poly (acrylonitrile-co-butadiene-co-styrene) polymers, acrylic polymers such as the polymethylmethacrylate, poly-n-butyl acrylate, poly(ethylene-co-acrylic acid), poly(ethylene-co-methacrylate), etc.; fluoropolymers including polytetrafluoroethylene (teflon), poly(ethylene-co-tetrafluoroethylene) copolymers, (tet
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