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: "BoPi - a distributed machine for experimenting Web services technologies"
  Abstract: BoPi is a programming language with a runtime support that allows the distribution and the execution of programs over the network. The language is a process calculus with XML values and datatypes, and with a pattern matching mechanism for deconstructing values. The compiler gives a typesafe bytecode in the form of an XML document, that may be deployed on the network. What comes out is a simple, statically typed, and formally defined core BPEL language with a basic query mechanism supplied by patterns.

Connected through hyperedge HE-1 (induced by source paper "PiDuce: a process calculus with native XML datatypes"):
  with members:
    (none)

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