http://www.w3.org/ns/prov#value | - Block information includes a block priority 2-1 which represents a priority order of blocks if blocks overlap each other, a flag 202 representing whether a block is a block floating on the basis of a sentence in a document (to be referred to as a floating block hereinafter) or a block permanently pasted at a given position of a given page independently of sentences (to be referred to as a fixed bl
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