human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "W3QS: A Query System for the World-Wide Web"
  Abstract: The World-Wide Web (WWW) is an ever growing, distributed, non-administered, global information resource. It resides on the worldwide computer network and allows access to heterogeneous information: text, image, video, sound and graphic data. Currently, this wealth of information is difficult to mine. One can either manually, slowly and tediously navigate through the WWW or utilize indexes and libraries which are built by automatic search engines (called knowbots or robots). We have designed and are now implementing a high level SQL-like language to support effective and flexible query processing, which addresses the structure and content of WWW nodes and their varied sorts of data. Query results are intuitively presented and continuously maintained when desired. The language itself integrates new utilities and existing Unix tools (e.g. grep, awk). The implementation strategy is to employ existing WWW browsers and Unix tools to the extent possible.

Connected through hyperedge HE-1 (induced by source paper "Expressing structural hypertext queries in graphlog"):
  with members:
    - "Finding Regular Simple Paths in Graph Databases"

Connected through hyperedge HE-2 (induced by source paper "Semi-automatic wrapper generation for Internet information sources"):
  with members:
    - "Generating finite-state transducers for semi-structured data extraction from the Web"

Connected through hyperedge HE-3 (induced by source paper "A Web-based information system that reasons with structured collections of text"):
  with members:
    - "The Wasabi Personal Shopper: a case-based recommender system"

Connected through hyperedge HE-4 (induced by source paper "WSQ/DSQ: a practical approach for combined querying of databases and the Web"):
  with members:
    - "The declarative imperative: experiences and conjectures in distributed logic"

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science