| http://www.w3.org/ns/prov#value | - Each network element 16 has a mapping function that for every value of V, specifies one or more elements from the set D that store the data specified by volume V, where N is greater than or equal to 1 and is an integer and N+D is greater than or equal to 3, wherein network elements 16 and disk elements 12 can be added dynamically.
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