Software requirements definition for a specification database

The author proposes a method to build a relational database of software requirements specifications (SRSs) from textual and visual SRSs automatically. The author has been developing a requirements model named Requirements Frame, a text-based requirements language and a visual requirements language based on the model in order to improve the quality of SRSs. Since Requirements Frame can be transformed into a relational data model, each of the requirement sentences can be regarded as a tuple of a relational table. The author has been developing both a query language and a relational database management system for an SRS database. One of the features of the SRS DB system is to show an answer with a requirement sentence as an example/counter-example. This feature contributes to verify the SRS from a developer´s own viewpoint. Another feature is to detect the changed requirements in modification of the SRS. This feature contributes to effective maintenance of the SRS