| http://www.w3.org/ns/prov#value | - FIG. 2 is a flowchart for explaining a process in which synchronization between the shadow image 131 a managed by the center DBMS 14 and the local DB 134 a managed by the local DBMS 129 a and that between the shadow image 131 b managed by the center DBMS 14 and the local DB 134 b managed by the local DBMS 129 b are established and data of the plurality of local DB's are accessed in a consolidated
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