We investigate interoperable query processing with heterogeneous networked information servers. Typically, these servers may be object or relational databases, specialized file servers accessing for example, image databases, WAIS servers that support simple queries over text databases, and internet based search engines or scripts that provide indexes over files, documents and databases. We focus our research on several areas as follows:

1. High order wrapper definition and query languages for defining meta-wrapper interfaces wrt source interfaces, and for expressing queries and plans.
2. Query optimization and evaluation for dynamically evolving environments.
3. Tools for the automatic generation of wrappers for Web-based sources.
4. Semantic query optimization for object and object-relational databases.
5. Mediators which perform query reformulation and decomposition, based on a common object model, and wrappers/translators for query interoperation between object and relational schema.
6. KIF based mediators for the semantic interoperation of multiple object databases with dissimilar semantics.