Couchbase can store XML data alongside its native JSON format, leveraging its ecosystem of services including N1QL, Indexing, Full-Text Search, Eventing, and Analytics to provide a scalable and efficient solution for storing and processing XML data. By utilizing the Eventing service, developers can automatically convert XML into native JSON representations with minimal effort, taking advantage of Couchbase's features like indexing, full-text search, and analytics to efficiently query and manipulate the data. The Eventing function allows users to write pure business logic while leveraging Couchbase's infrastructure for scalability and reliability, making it an effective solution for handling XML data in a distributed document-oriented database.