How do you create a DataWeave expression?

Creating a DataWeave expression involves defining the transformation logic with the appropriate header that indicates the version of DataWeave being used. In this case, the correct choice is indicated by using the (%dw 2.0) header. This header specifies that you want to use the DataWeave version 2.0, which comes with enhancements and new features compared to the previous version.

After specifying this header, you would proceed to write your transformation logic, which can include specifying input and output formats, data manipulation, and various transformation functions. This structured approach allows developers to effectively manipulate data between different formats such as JSON, XML, CSV, and more.

Other approaches, such as using just JavaScript code or limiting transformation to XML only, do not align with the correct use of DataWeave, which is designed to be a powerful transformation language capable of handling a variety of data formats beyond just XML. The mention of a version like (%dw 1.0) also reflects an outdated practice, as version 2.0 is the current standard used for new transformations. Thus, selecting the method that correctly utilizes the DataWeave version header and transformation logic is essential for creating effective DataWeave expressions.