Help wanted on json plugin

[1208nn]

I'm creating a json plugin to add some intersections. What's the "type" in the json should be? I tried "building" "intersection(s)" and "template", but none of them works. I searched this site but no result.

For an example:

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[
  {
    "id": "$1208nn.roundabout",

    "type": "building",//what this should be?

    "author": "1208nn",
    "width":5,
    "height":5,
    "composition":[
      {"id":"$road01","x0":2,"y1":0,"y0":0,"x1":2},
      {"id":"$road05_ramp00","x0":1,"y1":1,"y0":1,"x1":3},
      {"id":"$road05_ramp00","x0":1,"y1":3,"y0":1,"x1":1},
      {"id":"$road01","x0":0,"y1":2,"y0":2,"x1":0},
      {"id":"$road05_ramp00","x0":3,"y1":3,"y0":2,"x1":3},
      {"id":"$road01","x0":4,"y1":2,"y0":2,"x1":4},
      {"id":"$road05_ramp00","x0":2,"y1":3,"y0":3,"x1":3},
      {"id":"$road01","x0":2,"y1":4,"y0":4,"x1":2}
    ]
  }
]

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...

I don't know why.
Is there a template json plugin for intersections?



Or is there a plugin like a bookmark to save a group of buildings.