| http://www.w3.org/ns/prov#value | - Some clerks think that you are paying for the stamp and the stamp is a product and is somehow worth the dollar figure printed on the stamp (plus tax) but actually you are paying for the service provided and the stamp (just worth 1/2 cent or so probably), with a cancel, is acknowledgment of the payment of the service.They would never have issued stamps in the first place if everyone would come down
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