| http://www.w3.org/ns/prov#value | - data collection site 18 does not need the image from the client. [0046] However, if the reference checksum computed at the block 708 does not match the checksum contained in the data received from the client at the block 702, the software routine 700 at a block 714 attempts to retrieve the image from another source, i.e., a source other than the Web site corresponding to the URL. Such other source
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