Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Framework for Federated SPARQL Query Processing over Heterogeneous
  Linked Data Fragments   Linked Data Fragments (LDFs) refer to Web interfaces that allow for accessing
and querying Knowledge Graphs on the Web. These interfaces, such as SPARQL
endpoints or Triple Pattern Fragment servers, differ in the SPARQL expressions
they can evaluate and the metadata they provide. Client-side query processing
approaches have been proposed and are tailored to evaluate queries over
individual interfaces. Moreover, federated query processing has focused on
federations with a single type of LDF interface, typically SPARQL endpoints. In
this work, we address the challenges of SPARQL query processing over
federations with heterogeneous LDF interfaces. To this end, we formalize the
concept of federations of Linked Data Fragment and propose a framework for
federated querying over heterogeneous federations with different LDF
interfaces. The framework comprises query decomposition, query planning, and
physical operators adapted to the particularities of different LDF interfaces.
Further, we propose an approach for each component of our framework and
evaluate them in an experimental study on the well-known FedBench benchmark.
The results show a substantial improvement in performance achieved by devising
these interface-aware approaches exploiting the capabilities of heterogeneous
interfaces in federations.

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The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
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The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex