* This function builds a graph in the order of breadth-first search. If style * descriptor maps are given then the added nodes and edges are decorated. * @param graph_ The graph will be appended by the new nodes and edges. * @param startNode_ Breadth-first search starts from this node. This node is * not inserted into the returning set unless there is a loop in the graph which * contains this
source not stored for this graph (policy: none)
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