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: "datalog rewritings of regular path queries using views"
  Abstract: We consider query answering using views on graph databases, i.e. databases structured as edge-labeled graphs. We mainly consider views and queries specified by Regular Path Queries (RPQ). These are queries selecting pairs of nodes in a graph database that are connected via a path whose sequence of edge labels belongs to some regular language. We say that a view V determines a query Q if for all graph databases D, the view image V(D) always contains enough information to answer Q on D. In other words, there is a well defined function from V(D) to Q(D). Our main result shows that when this function is monotone, there exists a rewriting of Q as a Datalog query over the view instance V(D). In particular the rewriting query can be evaluated in time polynomial in the size of V(D). Moreover this implies that it is decidable whether an RPQ query can be rewritten in Datalog using RPQ views.

Connected through hyperedge HE-1 (induced by source paper "on monotonic determinacy and rewritability for recursive queries and views"):
  with members:
    - "can one escape red chains regular path queries determinacy is undecidable"
    - "definability and interpolation within decidable fixpoint logics"
    - "red spider meets a rainworm conjunctive query finite determinacy is undecidable"
    - "the hunt for a red spider conjunctive query determinacy is undecidable"

Connected through hyperedge HE-2 (induced by source paper "can one escape red chains regular path queries determinacy is undecidable"):
  with members:
    - "red spider meets a rainworm conjunctive query finite determinacy is undecidable"
    - "the hunt for a red spider conjunctive query determinacy is undecidable"
    - "the view update problem revisited"

Connected through hyperedge HE-3 (induced by source paper "red spider meets a rainworm conjunctive query finite determinacy is undecidable"):
  with members:
    - "the hunt for a red spider conjunctive query determinacy is undecidable"
    - "querying the guarded fragment"
    - "converging to the chase a tool for finite controllability"
    - "the view update problem revisited"

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)