| http://www.w3.org/ns/prov#value | - exchange of information between the client and vendor is composed of several stages, e.g. the client also need to approve the form 122 s to the vendor or to fill in some details which the vendor may need to approve in turn. [0149] In another preferred embodiment of the present invention, the client 110 sends the vendor 120 the request for confirmation 132 s as it arrives from the verifier 130. [0
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