[
  {
    "name": "Caller",
    "id": "my.Caller",
    "appliesTo": [
      "bpmn:CallActivity"
    ],
    "properties": [
      {
        "label": "Called Process",
        "type": "String",
        "editable": false,
        "value": "calledProcess",
        "binding": {
          "type": "property",
          "name": "calledElement"
        }
      },
      {
        "label": "Input source variable",
        "type": "String",
        "value": "var_local",
        "binding": {
          "type": "camunda:in",
          "target": "var_called_source"
        }
      },
      {
        "label": "Output target (source variable)",
        "type": "String",
        "value": "var_called",
        "binding": {
          "type": "camunda:out",
          "source": "var_local_source"
        }
      },
      {
        "label": "Input sourceExpression",
        "type": "String",
        "value": "${expr_local}",
        "binding": {
          "type": "camunda:in",
          "target": "var_called_expr",
          "expression": true
        }
      },
      {
        "label": "Output target (sourceExpression)",
        "type": "String",
        "value": "var_local_expr",
        "binding": {
          "type": "camunda:out",
          "sourceExpression": "${expr_called}"
        }
      },
      {
        "label": "Input all",
        "type": "Hidden",
        "binding": {
          "type": "camunda:in",
          "variables": "all"
        }
      },
      {
        "label": "Output all",
        "type": "Hidden",
        "binding": {
          "type": "camunda:out",
          "variables": "all"
        }
      },
      {
        "label": "Input all local",
        "type": "Hidden",
        "binding": {
          "type": "camunda:in",
          "variables": "local"
        }
      },
      {
        "label": "Output all local",
        "type": "Hidden",
        "binding": {
          "type": "camunda:out",
          "variables": "local"
        }
      },
      {
        "label": "Input business key",
        "description": "Provide the expression retrieving the business key.",
        "type": "String",
        "value": "${execution.processBusinessKey}",
        "binding": {
          "type": "camunda:in:businessKey"
        }
      }
    ]
  }
]