| http://www.w3.org/ns/prov#value | - Briefly, a directed acyclic graph is a graph in which edges have a direction (an edge from node A to node B is different from an edge from node B to node A), and cycles are not permitted (a cycle is a sequence of edges from one node to another in which by following the edges from one node to the next, it is possible to return to a node previously visited).
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