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: "tracing where iot data are collected and aggregated"
  Abstract: The Internet of Things (IoT) offers the infrastructure of the information#N#society. It hosts smart objects that automatically collect and exchange data of#N#various kinds, directly gathered from sensors or generated by aggregations.#N#Suitable coordination primitives and analysis mechanisms are in order to design#N#and reason about IoT systems, and to intercept the implied technological#N#shifts. We address these issues from a foundational point of view. To study#N#them, we define IoT-LySa, a process calculus endowed with a static analysis#N#that tracks the provenance and the manipulation of IoT data, and how they flow#N#in the system. The results of the analysis can be used by a designer to check#N#the behaviour of smart objects, in particular to verify non-functional#N#properties, among which security.

Connected through hyperedge HE-1 (induced by source paper "a formal approach to the engineering of domain specific distributed systems"):
  with members:
    - "on the power of attribute based communication"
    - "a rigorous framework for specification analysis and enforcement of access control policies"
    - "a concurrent pattern calculus"
    - "blind date conversation joining"
    - "psi calculi a framework for mobile processes with nominal data and logic"

Connected through hyperedge HE-2 (induced by source paper "tool supported analysis of iot"):
  with members:
    - "a step towards checking security in iot"
    - "honesty by typing"

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)