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: "towards a system model for uml the structural data model"
  Abstract: In this document we introduce a system model as the basis for a semantic model for UML 2.0. The system model is supposed to form the core and foundation of the UML semantics definition. For that purpose the basic system is targeted towards UML. This document is structured as follows: In the rest of Section 1 we will discuss the general approach and highlight the main decisions. This section is important to understand the rest of this document. Section 2 contains the actual definition of the structural part of the system model. It is built in layers as described in Section 1. For brevity of the approach, we defer deeper discussions into the Appendix in Section 4. This document is part of a project on the formalization of the UML 2.0 in cooperation between the Queens University Kingston and the Technische Universit\"aten Braunschweig and M\"unchen. This version 1.0 is the result of a longer effort to define the structure, behavior and interaction of object-oriented, possibly distributed systems abstract enough to be of general value, but also in sufficient detail for a semantic foundation of the UML. We also wish to thank external reviewers, and especially Gregor von Bochmann, Gregor Engels and S\'ebastien G\'erard for their help.

Connected through hyperedge HE-1 (induced by source paper "montiarc architectural modeling of interactive distributed and cyber physical systems"):
  with members:
    - "efficient editor generation for compositional dsls in eclipse"
    - "towards a family based analysis of applicability conditions in architectural delta models"
    - "system model semantics of class diagrams"
    - "monticore a framework for compositional development of domain specific languages"
    - "modelling automotive function nets with views for features variants and modes"
    - "delta modeling for software architectures"
    - "monticore modular development of textual domain specific languages"
    - "design guidelines for domain specific languages"

Connected through hyperedge HE-2 (induced by source paper "system model semantics of class diagrams"):
  with members:
    - "monticore modular development of textual domain specific languages"
    - "an algebraic view on the semantics of model composition"
    - "system model semantics of statecharts"
    - "integrated definition of abstract and concrete syntax for textual languages"

Connected through hyperedge HE-3 (induced by source paper "an algebraic view on the semantics of model composition"):
  with members:
    - "a note on semantics with an emphasis on uml"
    - "the uml as a formal modeling notation"

Connected through hyperedge HE-4 (induced by source paper "system model based simulation of uml models"):
  with members:
    - "integrated definition of abstract and concrete syntax for textual languages"

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)