Generalized Feature Trees (GFTs)

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features
	XOR_Root {abstract, aux}
		alternative
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							Weighted 
				mandatory
					DFSearch 
				optional
					Alg {abstract}
						or
							MSTKruskal 
							Shortest 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							Weighted 
				optional
					Alg {abstract}
						or
							MSTKruskal 
							Shortest 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							Weighted 
				mandatory
					DFSearch 
				mandatory
					Alg {abstract}
						mandatory
							Connected 
						optional
							MSTKruskal 
						optional
							Shortest 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							Weighted 
				mandatory
					Alg {abstract}
						mandatory
							Connected 
						optional
							MSTKruskal 
						optional
							Shortest 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							UnWeighted 
				mandatory
					DFSearch 
				optional
					Alg {abstract}
						mandatory
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							UnWeighted 
				optional
					Alg {abstract}
						mandatory
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							UnWeighted 
				mandatory
					DFSearch 
				mandatory
					Alg {abstract}
						mandatory
							Connected 
						optional
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Directed 
				mandatory
					Weight {abstract}
						mandatory
							UnWeighted 
				mandatory
					Alg {abstract}
						mandatory
							Connected 
						optional
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Undirected 
				mandatory
					Weight {abstract}
						mandatory
							Weighted 
				mandatory
					DFSearch 
				optional
					Alg {abstract}
						mandatory
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Undirected 
				mandatory
					Weight {abstract}
						mandatory
							Weighted 
				optional
					Alg {abstract}
						mandatory
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Undirected 
				mandatory
					Weight {abstract}
						mandatory
							Weighted 
				mandatory
					DFSearch 
				mandatory
					Alg {abstract}
						mandatory
							Connected 
						optional
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Undirected 
				mandatory
					Weight {abstract}
						mandatory
							UnWeighted 
				mandatory
					DFSearch 
				optional
					Alg {abstract}
						mandatory
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Undirected 
				mandatory
					Weight {abstract}
						mandatory
							UnWeighted 
				optional
					Alg {abstract}
						mandatory
							MSTKruskal 
			Gpl {abstract}
				mandatory
					GraphType {abstract}
						mandatory
							Undirected 
				mandatory
					Weight {abstract}
						mandatory
							UnWeighted 
				mandatory
					DFSearch 
				mandatory
					Alg {abstract}
						mandatory
							Connected 
						optional
							MSTKruskal