| http://www.w3.org/ns/prov#value | - node (a leaf) of the tree on a relative 0-1 scale with the following equation: nda = (# of internal nodes between nodes r and a)/(# of internal nodes between nodes r and m), where a means a target leaf node, r is a hypothetical root node, and m is a leaf node that has the largest possible number of internal nodes from the node
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