IBM Content Navigator External Data Services response.

response.json

{
    "externalDataIdentifier": "opaque_identifier_meaningful_to_the_service",
    "properties": [
        {
            "symbolicName": "symbolic_name",
            "value": "potential_new_value",
            "customValidationError": "Description of an invalid reason",
            "customInvalidItems": [
                0,
                3,
                4,
                8
            ],
            "displayMode": "readonly_or_readwrite",
            "required": true,
            "hidden": true,
            "maxValue": 1,
            "minValue": 2,
            "maxLength": 20,
            "choiceList": {
                "displayName": "display_name",
                "choices": [
                    {
                        "displayName": "name",
                        "value": "value1"
                    }
                ]
            },
            "hasDependentProperties": true
        }
    ]
}