human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge groups authors who co-authored the same paper.

Details of the hypergraph:
Center hyperedge (induced by source paper "Methodology of schema integration for new database applications: a practitioner's approach"):
  Abstract: A practitionerâ€™s approach to integrate databases and evolve them so as to support new database applications is presented. The approach consists of a joint bottom-up and top-down methodology; the bottom-up approach is taken to integrate existing database using standard schema integration techniques (B-Schema), the top-down approach is used to develop a database schema for the new applications (T-Schema). The T-Schema uses a joint functional-data analysis. The B-schema is evolved by comparing it with the generated T-schema. This facilitates an evolutionary approach to integrate existing databases to support new applications as and when needed. The mutual completeness check of the T-Schema against B-Schema derive the schema modification steps to be performed on B-Schema to meet the requirements of the new database applications. A case study is presented to illustrate the methodology.

Includes members:
  Member "Federated database systems for managing distributed, heterogeneous, and autonomous databases":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Piazza: data management infrastructure for semantic web applications")
  Member "Web data integration for e-commerce applications":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "Kopplungsstrategien für Anwendungssysteme im Krankenhaus")

Question: Please tell me which research area the co-authored paper (i.e., the source paper of the center hyperedge) belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science