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 "ontology mediated queries combined complexity and succinctness of rewritings via circuit complexity"):
  Abstract: We give solutions to two fundamental computational problems in ontologybased data access with the W3C standard ontology language OWL2QL: the succinctness problem for first-order rewritings of ontology-mediated queries (OMQs), and the complexity problem for OMQ answering. We classify OMQs according to the shape of their conjunctive queries (treewidth, the number of leaves) and the existential depth of their ontologies. For each of these classes, we determine the combined complexity of OMQ answering, and whether all OMQs in the class have polynomial-size first-order, positive existential, and nonrecursive datalog rewritings. We obtain the succinctness results using hypergraph programs, a new computational model for Boolean functions, which makes it possible to connect the size of OMQ rewritings and circuit complexity.

Includes members:
  Member "the complexity of ontology based data access with owl 2 ql and bounded treewidth queries":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "when is ontology mediated querying efficient")
  Member "theoretically optimal datalog rewritings for owl 2 ql ontology mediated queries":
    also connected through other hyperedges:
      (none)
  Member "datalog rewritability of disjunctive datalog programs and its applications to ontology reasoning":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "a complete classification of the complexity and rewritability of ontology mediated queries based on the description logic el")
  Member "tree like queries in owl 2 ql succinctness and complexity results":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "the complexity of ontology based data access with owl 2 ql and bounded treewidth queries")
  Member "sound complete and minimal ucq rewriting for existential rules":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "the space efficient core of vadalog")
  Member "ontology based data access a study through disjunctive datalog csp and mmsnp":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "asnp a tame fragment of existential second order logic")
  Member "exponential lower bounds and separation for query rewriting":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "the lagrangian remainder of taylor s series distinguishes mathcal o f x time complexities to polynomials or not")
  Member "rewriting ontological queries into small nonrecursive datalog programs":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "polynomial rewritings from expressive description logics with closed predicates to variants of datalog")

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)