| http://www.w3.org/ns/prov#value | - In some embodiments, an input device 222 may comprise an optical reader (e.g., a 2-D bar code scanner) capable of scanning a barcode, such as a bar code which is displayed on a screen or monitor of a user's cellular phone, PDA, Blackberry??? business phone, Blackberry??? handheld or other handheld device.
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