What should a new field in an entity extension end with?

When creating a new field within an entity extension in Guidewire, it is best practice for the field name to end with _Ext. This convention helps to clearly signify that the field is an extension of an existing entity, thereby making the code more maintainable and understandable for other developers who may work on the codebase in the future. The suffix _Ext provides a clear distinction between original fields and those that have been added or modified, reducing the chances of confusion regarding which fields are part of the standard model versus those that are specific to a particular implementation.

The other alternatives do not align with Guidewire’s naming conventions for entity extensions. For example, _Int, _Def, and _New do not communicate the concept of extension effectively and could lead to ambiguity if used. By adhering to the convention of using _Ext, developers can ensure consistency across the codebase, which is vital for collaborative development environments.