| http://www.w3.org/ns/prov#value | - In fact, it would be unusual to have both the RF tag reader (10) and the bar code reader (40) attached to the hand-held terminal (30) at the same time, because normally a user is dealing either with RF tags (21) or with bar codes (45) and is probably not dealing with a situation where both types of readers are necessary at the same time.
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