human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "an information network overlay architecture for the nsdl"
  Abstract: We describe the underlying data model and implementation of a new architecture for the National Science Digital Library (NSDL) by the Core Integration Team (CI). The architecture is based on the notion of an information network overlay. This network, implemented as a graph of digital objects in a Fedora repository, allows the representation of multiple information entities and their relationships. The architecture provides the framework for contextualization and reuse of resources, which we argue is essential for the utility of the NSDL as a tool for teaching and learning.

Connected through hyperedge HE-1 (induced by source paper "ncore architecture and implementation of a flexible collaborative digital library"):
  with members:
    - "representing contextualized information in the nsdl"
    - "metadata aggregation and automated digital libraries a retrospective on the nsdl experience"
    - "adapting cbpp platforms for instructional use"
    - "fedora an architecture for complex objects and their relationships"

Connected through hyperedge HE-2 (induced by source paper "metadata aggregation and automated digital libraries a retrospective on the nsdl experience"):
  with members:
    - "the oai data provider registration and validation service"
    - "initial experiences re exporting duplicate and similarity computation with an oai pmh aggregator"
    - "core services in the architecture of the national digital library for science education nsdl"

Connected through hyperedge HE-3 (induced by source paper "fedora an architecture for complex objects and their relationships"):
  with members:
    - "flexible and extensible digital object and repository architecture fedora"
    - "policy carrying policy enforcing digital objects"
    - "the mellon fedora project digital library architecture meets xml and web services"
    - "adore a modular standards based digital object repository"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.DL(Digital Libraries)