| http://www.w3.org/ns/prov#value | - Data element queue instructions 303 are adapted to be executed on processor 301 to sign a data element XN+1 and a signature SQ=S[N] at a first resource to obtain a signature S[XN+1,S[N]], where N is an integer, send the data element XN+1 and the signature S[XN+1,S[N]] from the first resource to the second resource to be stored in the queue at the second resource; and store the signature S[XN+1,S[N
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