Supporting domain-specific functions and relieving users from the database details are two major challenges faced by many todays database applications, especially in life science research. The most commonly used workaround is the form-based query interface. However, it has severe limitations on expressive ability, extensibility, and flexibility. Unlike most of previous studies that adopted domain-specific query strategies, this book proposes a conceptual query methodology that can be generally applied in any domain. Meanwhile, it allows data-users to define their own domain-specific query...