human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "dichotomies in ontology mediated querying with the guarded fragment"):
  Abstract: We study the complexity of ontology-mediated querying when ontologies are formulated in the guarded fragment of first-order logic (GF). Our general aim is to classify the data complexity on the level of ontologies where query evaluation w.r.t. an ontology O is considered to be in PTime if all (unions of conjunctive) queries can be evaluated in PTime w.r.t. O and coNP-hard if at least one query is coNP-hard w.r.t. O. We identify several large and relevant fragments of GF that enjoy a dichotomy between PTime and coNP, some of them additionally admitting a form of counting. In fact, almost all ontologies in the BioPortal repository fall into these fragments or can easily be rewritten to do so. We then establish a variation of Ladner's Theorem on the existence of NP-intermediate problems and use this result to show that for other fragments, there is provably no such dichotomy. Again for other fragments (such as full GF), establishing a dichotomy implies the Feder-Vardi conjecture on the complexity of constraint satisfaction problems. We also link these results to Datalog-rewritability and study the decidability of whether a given ontology enjoys PTime query evaluation, presenting both positive and negative results.

Includes members:
  Member "a dichotomy theorem for nonuniform csps":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "when symmetries are not enough a hierarchy of hard constraint satisfaction problems")
  Member "rewritability in monadic disjunctive datalog mmsnp and expressive description logics":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "a journey into ontology approximation from non horn to hon")
  Member "extending consequence based reasoning to sriq":
    also connected through other hyperedges:
      (none)
  Member "asking the metaquestions in constraint tractability":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "algebraic approach to promise constraint satisfaction")
  Member "query rewriting and optimization for ontological databases":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "data complexity and rewritability of ontology mediated queries in metric temporal logic under the event based semantics full version")
  Member "querying the guarded fragment":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "finite open world query answering with number restrictions")
  Member "ontology based data access a study through disjunctive datalog csp and mmsnp":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "asnp a tame fragment of existential second order logic")
  Member "a dichotomy on the complexity of consistent query answering for atoms with simple keys":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "new results for the complexity of resilience for binary conjunctive queries with self joins")

Question: Please tell me which class the source paper 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)