| http://www.w3.org/ns/prov#value | - you could use a flag, such as on server with a int/bool 1/0 for yes or no. when a record/file/block of data gets sent, check for success at server, and flip the bit to yes. then if you are using something like SQLite, you can do a SELECT * FROM my_table WHERE sent = 0 type thing to send any new records
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