L. L. Yang, T. Ozsu, and L. Liu. Accessing heterogeneous data through homogenization and integration mediators . All mediators are data model specific. Currently the system has relational and objectoriented mediators. This paper considers only the relational ones.
Wrappers support relational interface to sources.
L. L. Yan, T. Ozsu, and L. Liu. Accessing heterogeneous data through homogenization and integration mediators . Resolve domain unit population mismatches. MEA RH extends the relational algebra with operators specially designed for homogenization. These new operators are retrieve, pad, rename, and deriveAttr.