| http://www.w3.org/ns/prov#value | - For example, they can be made of any suitable material such as glass, metals and alloys, for example aluminum, copper, iron and stainless steel, and plastic polymers, for example halogen containing polymers, such as polytetrafluoroethylene (PTFE) e.g., Teflon??, polyacrylates, such as polymethyl methacrylate (PMMA) e.g., Perspex??, polyoxyalkylenes, such as polyoxymethylene (POM) e.g., Delrine??,
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