Ciset relational database for seamless integration of multi-source data

The aim of this paper is to introduce ciset relational database. The relational database lacks the ability to combine opposing and supporting evidences related to a fact. On the other hand, the ciset relational database has the capability to integrate both supporting and opposing evidences relating to the same fact in a seamless fashion. The ciset relational database is a generalization of the relational database theory. Given two relations A and B, one may convert them to corresponding cisets. Performing a ciset operation and converting the result back to a relation is equivalent to applying the relational operation on A and B directly. Similarly, if you perform a relational operation first and then convert them to ciset relation it has the same effect as converting to ciset and then performing the ciset operation. Concepts such as primary key, foreign key and data integrity rules are also presented.