# data accessor

- As a property of the task, it is used to limit the required value among the data in [scenario context](./scenario-context.md).
- Context data is an object that has the name of each step as a Key and maintains the result value of the step as a Value.
- Therefore, the accessor always starts with the name of the step, and if you want to further limit the value below that value, you can use an expression that specifies the value of the JavaScript object.
- You can also use the result of data transformation.
- How to set data accessor follows the specification of [JSONATA Document](http://docs.jsonata.org/overview).
- example
  - `stepname`
  - `stepname.property`
  - `stepname.property.property. ...`
