{
  "fields": [
    {
      "field": "ECR.1",
      "minOccurs": "1",
      "maxOccurs": "1"
    },
    {
      "field": "ECR.2",
      "minOccurs": "1",
      "maxOccurs": "1"
    },
    {
      "field": "ECR.3",
      "minOccurs": "0",
      "maxOccurs": "unbounded"
    }
  ]
}