Illustrating performance as a dimension or not.

performance_dimension.json

{ 
  "MAPT_data_points":[
    { "performer": "Alice",
      "time": "2019-01-01",
      "measure": "Documentation Rate",
      "performance": "0.90"
    },
    { "performer": "Alice",
      "time": "2019-02-01",
      "measure": "Documentation Rate",
      "performance": "0.80"
    }
  ] 
},

{     
  "MAT_data_points":[
    { "performer": "Alice",
      "time": "2019-01-01",
      "measure": {
        "name": "Documentation Rate",
        "value": 0.90
      }
    },
    { "performer": "Alice",
      "time": "2019-02-01",
      "measure": {
        "name": "Documentation Rate",
        "value": 0.80
      }
    }
  ]
}