Sample Graph in GML Format

graph [
    comment "This is a sample graph"
    directed 1
    id 42
    label "Hello, I am a graph"
    node [
        id 1
        label "Node 1"
        thisIsASampleAttribute 42
    ]
    node [
        id 2
        label "node 2"
        thisIsASampleAttribute 43
    ]
    node [
        id 3
        label "node 3"
        thisIsASampleAttribute 44
    ]
    edge [
        source 1
        target 2
        label "Edge from node 1 to node 2"
    ]
    edge [
        source 2
        target 3
        label "Edge from node 2 to node 3"
    ]
    edge [
        source 3
        target 1
        label "Edge from node 3 to node 1"
    ]
]