gistfile1.txt

{
  "run" : {
    "number": null,
    "displayName": null,
    "action": [
      "testResult" : null
    ]
  }
}

-> run[number,displayName,action[testResult]]

=============================
// module X
Model.define(Run,{
  "number": null
})
=============================
// module Y
Model.define(Run,{
  "displayName": null,
  "action": [
    "_class" : ">TestResultAction",
    "testResult" : null
  ]
})
=============================
// module Z
Model.define(Run,{
  "action": [
    "_class" : ">GitBuildData",
    "commit" : null
  ]
})