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: "modelling homogeneous generative meta programming"
  Abstract: Homogeneous generative meta-programming (HGMP) enables the generation of program fragments at compile-time or run-time. We present the first foundational calculus which can model powerful HGMP languages such as Template Haskell. The calculus is designed such that we can gradually enhance it with the features needed to model many of the advanced features of real languages. As a demonstration of the flexibility of our approach, we also provide a simple type system for the calculus.

Connected through hyperedge HE-1 (induced by source paper "understanding the expressive power of unhygienic substitution in metaprogramming via combinatory logic"):
  with members:
    - "dual context calculi for modal logic"

Connected through hyperedge HE-2 (induced by source paper "incorporating quotation and evaluation into church s type theory"):
  with members:
    - "hol light qe"
    - "theory morphisms in church s type theory with quotation and evaluation"
    - "formalizing mathematical knowledge as a biform theory graph a case study"
    - "incorporating quotation and evaluation into church s type theory syntax and semantics"
    - "on the semantics of reflect as a basis for a reflective theorem prover"
    - "the formalization of syntax based mathematical algorithms using quotation and evaluation"
    - "frameworks for reasoning about syntax that utilize quotation and evaluation"
    - "tactics for reasoning modulo ac in coq"

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.PL(Programming Languages)