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: "pattern reification as the basis for description driven systems"
  Abstract: One of the main factors driving object-oriented software development for information systems is the requirement for systems to be tolerant to change. To address this issue in designing systems, this paper proposes a pattern-based, object-oriented, description-driven system (DDS) architecture as an extension to the standard UML four-layer meta-model. A DDS architecture is proposed in which aspects of both static and dynamic systems behavior can be captured via descriptive models and meta-models. The proposed architecture embodies four main elements - firstly, the adoption of a multi-layered meta-modeling architecture and reflective meta-level architecture, secondly the identification of four data modeling relationships that can be made explicit such that they can be modified dynamically, thirdly the identification of five design patterns which have emerged from practice and have proved essential in providing reusable building blocks for data management, and fourthly the encoding of the structural properties of the five design patterns by means of one fundamental pattern, the Graph pattern. A practical example of this philosophy, the CRISTAL project, is used to demonstrate the use of description-driven data objects to handle system evolution.

Connected through hyperedge HE-1 (induced by source paper "the deployment of an enhanced model driven architecture for business process management"):
  with members:
    - "evolvable systems for big data management in business"
    - "cristal ise provenance applied in industry"
    - "cristal a practical study in designing systems to cope with change"

Connected through hyperedge HE-2 (induced by source paper "facilitating evolution during design and implementation"):
  with members:
    - "cristal ise provenance applied in industry"
    - "cristal a practical study in designing systems to cope with change"
    - "providing traceability for neuroimaging analyses"

Connected through hyperedge HE-3 (induced by source paper "designing reusable systems that can handle change description driven systems revisiting object oriented principles"):
  with members:
    - "cristal a practical study in designing systems to cope with change"
    - "providing traceability for neuroimaging analyses"

Connected through hyperedge HE-4 (induced by source paper "cristal ise provenance applied in industry"):
  with members:
    - "cristal a practical study in designing systems to cope with change"

Connected through hyperedge HE-5 (induced by source paper "cristal a practical study in designing systems to cope with change"):
  with members:
    - "providing traceability for neuroimaging analyses"

Connected through hyperedge HE-6 (induced by source paper "providing traceability for neuroimaging analyses"):
  with members:
    - "an integrated e science analysis base for computation neuroscience experiments and analysis"
    - "reusable services from the neugrid project for grid based health applications"
    - "research traceability using provenance services for biomedical analysis"
    - "cloud computing and grid computing 360 degree compared"
    - "experiences of engineering grid based medical software"
    - "mammogrid a service oriented architecture based medical grid application"
    - "the anatomy of the grid enabling scalable virtual organizations"

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.DB(Databases)