What is a key characteristic of the Bottom Up integration method?

The Bottom Up integration method is characterized by starting with existing data sources, such as database tables, and then constructing the necessary components in the application based on those tables. In this context, Appian generates annotations directly from the existing database tables, which allows developers to leverage the pre-defined schemas and data structures. This approach ensures that the application is aligned with the underlying data model from the outset, simplifying the integration process and reducing the likelihood of errors that might arise from mismatched data definitions.

In contrast, while building custom data types (CDTs) before creating the database tables might be a part of the Top Down approach, it does not apply to the Bottom Up integration method, as the method relies on existing structures. Additionally, user input is not inherently a requirement of any specific integration method, and the integration method itself is not limited to operating only with cloud databases, as it can be applied to on-premises databases as well. Thus, the focus on Appian generating annotations from existing tables encapsulates the essence of the Bottom Up integration approach.