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: "cddiff semantic differencing for class diagrams"
  Abstract: Class diagrams (CDs), which specify classes and the relationships between them, are widely used for modeling the structure of object-oriented systems. As models, programs, and systems evolve over time, during the development lifecycle and beyond it, effective change management is a major challenge in software development, which has attracted much research efforts in recent years. In this paper we present cddiff, a semantic diff operator for CDs. Unlike most existing approaches to model comparison, which compare the concrete or the abstract syntax of two given diagrams and output a list of syntactical changes or edit operations, cddiff considers the semantics of the diagrams at hand and outputs a set of diff witnesses, each of which is an object model that is possible in the first CD and is not possible in the second. We motivate the use of cddiff, formally define it, and show how it is computed. The computation is based on a reduction to Alloy. The work is implemented in a prototype Eclipse plug-in. Examples show the unique contribution of our approach to the state-of-the-art in version comparison and evolution analysis.

Connected through hyperedge HE-1 (induced by source paper "empirical evaluation of effort on composing design models"):
  with members:
    - "addiff semantic differencing for activity diagrams"
    - "model driven development of complex software a research roadmap"

Connected through hyperedge HE-2 (induced by source paper "cd2alloy class diagrams analysis using alloy revisited"):
  with members:
    - "semantically configurable consistency analysis for class and object diagrams"
    - "system model semantics of class diagrams"
    - "monticore a framework for compositional development of domain specific languages"
    - "developing the uml as a formal modelling notation"
    - "the uml as a formal modeling notation"
    - "system model based definition of modeling language semantics"

Connected through hyperedge HE-3 (induced by source paper "an interim summary on semantic model differencing"):
  with members:
    - "an operational semantics for activity diagrams using smv"
    - "summarizing semantic model differences"
    - "a manifesto for semantic model differencing"
    - "addiff semantic differencing for activity diagrams"

Connected through hyperedge HE-4 (induced by source paper "model matching challenge benchmarks for ecore and bpmn diagrams"):
  with members:
    - "an interim summary on semantic model differencing"
    - "model evolution and management"
    - "a manifesto for semantic model differencing"
    - "addiff semantic differencing for activity diagrams"

Connected through hyperedge HE-5 (induced by source paper "modal object diagrams"):
  with members:
    - "system model semantics of class diagrams"
    - "monticore a framework for compositional development of domain specific languages"
    - "developing the uml as a formal modelling notation"
    - "the uml as a formal modeling notation"

Connected through hyperedge HE-6 (induced by source paper "summarizing semantic model differences"):
  with members:
    - "an operational semantics for activity diagrams using smv"
    - "a manifesto for semantic model differencing"
    - "the uml as a formal modeling notation"
    - "addiff semantic differencing for activity diagrams"

Connected through hyperedge HE-7 (induced by source paper "addiff semantic differencing for activity diagrams"):
  with members:
    - "an operational semantics for activity diagrams using smv"
    - "monticore a framework for compositional development of domain specific languages"
    - "a manifesto for semantic model differencing"

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.SE(Software Engineering)