| http://www.w3.org/ns/prov#value | - Each entry includes two values: [dist, v] (as an out-portal itself is a node, the entry has no sink element as in the node-keyword index).The IB-index for a block can be created by an algorithm similar to the backward expanding search algorithm given by [1], except that here one would be creating an index for all keywords in the block instead of answering queries at runtime.
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