| http://www.w3.org/ns/prov#value | - A subsystem may be equipment such as subway equipment (e.g., fare gates, fare validation equipment, ticket office machine, remote card reader and workstation, etc.), commuter rail equipment (e.g., fare validation equipment, ticket office machine, remote card reader and workstation, etc.), bus/LRV equipment (e.g. fare box, on-board validation equipment, garage computer system, etc.), or other subsy
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