What suffix does Guidewire recommend that typecodes added to a base application typelist should end with?

In Guidewire, it is a best practice to use the suffix "_Ext" for typecodes added to a base application typelist. This convention helps in clearly identifying these typecodes as extended or custom types that build upon the foundational types provided by the base application.

By using the "_Ext" suffix, developers can easily differentiate between the standard typecodes that are provided with the base application and those that have been customized or added for a specific implementation. This naming convention promotes clarity and organization within the codebase, making it easier for developers to manage and understand the type hierarchy in their applications.

The other suffixes do not convey the same meaning of extension or customization. For instance, "_Type" could imply a general type object but lacks specificity regarding its relationship to the base application. Similarly, "_Code" and "_Item" do not align with the established practices concerning extension and may lead to confusion about their role in the typelist. Thus, the use of "_Ext" is not only a recommendation but a standardized practice within Guidewire's development approach.