| http://www.w3.org/ns/prov#value | - The term ???document??? includes files and other items of any suitable medium, including graphical imagery, still and moving images, and sound. [0033] As described below in further detail, in response to a sales transaction between seller 18 and buyer 20, an originator 24 issues or transmits a sales transaction receipt 26 to buyer 20 via network 22 on behalf of seller 18.
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