Graph Test

<graph> {

 "width": 600,
 "height": 150,
 "background": "#ffffff",
 "data": [
   {
     "name": "tree",
     "values": [
       {"A": "Mammal","B": "Carnivore","C": "Panther" },
       {"A": "Mammal","B": "Carnivore","C": "Lion" },
       {"A": "Mammal","B": "Herbivore","C": "Cow" },
       {"A": "Mammal","B": "Herbivore","C": "Goat" },
       {"A": "Mammal","B": "Omnivore","C": "Human"},
       {"A": "Mammal","B": "Omnivore","C": "Bat"},
       {"A": "Fish","B": "Carnivore","C": "Shark"},
       {"A": "Fish","B": "Carnivore","C": "Electric Eel"},
       {"A": "Fish","B": "Omnivore","C": "Piranha "},
      {"A": "Fish","B": "Omnivore","C": "catfish "}
     ],
     "transform": [
       {
         "type": "treeify",
         "groupby": ["A","B"]
       },
       {
         "type": "hierarchy",
         "mode": "cluster",
         "nodesize": [20,100]
       },
       {
         "type": "formula",
         "field": "align",
         "expr": "'right'"
       },
       {
         "type": "formula",
         "field": "offset",
         "expr": "-10"
       }
     ]
   }
 ],
 "marks": [
   {
     "type": "path",
     "from": {
       "data": "tree",
       "transform": [
         {"type": "filter","test": "datum.parent"},
         {
           "type": "linkpath",
           "sourceX": "parent.layout_y",
           "sourceY": "parent.layout_x",
           "targetX": "layout_y",
           "targetY": "layout_x",
           "shape": "cornerX"
         }
       ]
     },
     "properties": {
       "enter": {
         "path": {"field": "layout_path"},
         "strokeWidth": {"value": 2},
         "stroke": {"value": "#000000"}
       }
     }
   },
   {
     "type": "text",
     "from": {
       "data": "tree",
       "transform": [
         {
           "type": "formula",
           "field": "ff_node_label",
           "expr": "if(datum.layout_depth == 0, 'Animals', if(datum.layout_depth == 1, datum.A, if(datum.layout_depth == 2, datum.B, if(datum.layout_depth == 3, datum.C, ))))"
         }
       ]
     },
     "properties": {
       "enter": {
         "x": {"field": "layout_y"},
         "dx": {"field": "offset"},
         "y": {"field": "layout_x"},
         "dy": {"value": -8},
         "font": {"value": "Arial"},
         "fontSize": {"value": 16},
         "align": {"field": "align"},
         "baseline": {"value": "middle"},
         "fill": {"value": "#0000ff"},
         "text": {"field": "ff_node_label"}
       }
     }
   }
 ]

}

</graph>