| http://www.w3.org/ns/prov#value | - Prospective business/conference visitors who will be using the Visa Waiver Program instead of obtaining a B-1 visa stamp and who want to enter in WB status MUST present a letter of invitation supporting this activity at the U.S. port-of-entry, particularly if the visitor will be receiving some sort of payment while in the U.S. in form of reimbursements, per diems, honoraria or speaker???s fees.
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