How does Appian typically read and generate CDTs in the Bottom Up approach?

Appian's Bottom Up approach to reading and generating Complex Data Types (CDTs) focuses on leveraging the underlying database structure to define the data model. In this context, the process involves reading table attributes directly from the database schema. This method allows developers to create CDTs that accurately reflect the actual structure and data types present in the relational database.

By directly accessing the database tables, Appian can identify the fields and relationships between those fields, which helps streamline the creation of CDTs that align closely with the underlying data. This approach contrasts with other methods, such as using UI elements or XML data, which do not have the same accuracy and completeness regarding the data structure and relationships found in the database.

Understanding this direct methodology emphasizes the efficiency of the Bottom Up approach in ensuring that the application’s data model maintains fidelity with the data it will ultimately interact with, which is paramount for effective app development in Appian.