human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent groups of papers sharing a common citing paper.

Details of the hypergraph:
Center node: "A Common LISP Hypermedia Server"
  Abstract: A World-Wide Web (WWW) server was implemented in Common LISP in order to facilitate exploratory programming in the global hypermedia domain and to provide access to complex research programs, particularly artificial intelligence systems. The server was initially used to provide interfaces for document retrieval and for email servers. More advanced applications include interfaces to systems for inductive rule learning and natural-language question answering. Continuing research seeks to more fully generalize automatic form-processing techniques developed for email servers to operate seamlessly over the Web. The conclusions argue that presentation-based interfaces and more sophisticated form processing should be moved into the clients in order to reduce the load on servers and provide more advanced interaction models for users.

Connected through hyperedge HE-1 (induced by source paper "Beyond Correlation: Bringing Artificial Intelligence to Events Data"):
  with members:
    - "Machine Learning Methods for International Conflict Databases: A Case Study in Predicting Mediation Outcome"

Question: Please tell me which class the center node belongs to. The 7 classes are: Neural_Networks, Reinforcement_Learning, Probabilistic_Methods, Theory, Genetic_Algorithms, Case_Based, Rule_Learning. Directly output the class name.

gpt: Rule_Learning