Described herein are methods and systems for interactively configuring and producing a data domain for various data structure elements of a computer program. A domain configuration manager is described which interactively receives domain configuration information corresponding to a data structure element, reads a reflection of the program and produces a data domain according to domain configuration information. The domain configuration manager is capable of producing a data domain for a data structure element according to such domain configuration information such as an explicit expression, inheritance or domain generation technique. The reflection of the computer program exposes the methods and functions of the program to be used in the explicit expression regardless of the visibility rules. Also, predicates and conditions can be used with domain generation techniques to further narrowly configure the data domains.