M2: gxl-1.0.gxl (UML-Representation)
M0:     GXL     Graph	available instances:      simple example complex example graph with typed, attributed edges attributes example undirected graph ordering of incidences hypergraph example hypergraph example II hierarchical graph hierarchy crossing edge
M1:     GXL     Graph     UML
M2:     GXL     Graph     UML

graph part: attribute part: value part: