A survey of Web cache replacement strategies
ACM Computing Surveys (CSUR)
Sindice.com: a document-oriented lookup index for open linked data
International Journal of Metadata, Semantics and Ontologies
Executing SPARQL Queries over the Web of Linked Data
ISWC '09 Proceedings of the 8th International Semantic Web Conference
Querying distributed RDF data sources with SPARQL
ESWC'08 Proceedings of the 5th European semantic web conference on The semantic web: research and applications
Linked data query processing strategies
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
Summary models for routing keywords to linked data sources
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
Semantics and optimization of the SPARQL 1.1 federation extension
ESWC'11 Proceedings of the 8th extended semantic web conference on The semanic web: research and applications - Volume Part II
FedX: optimization techniques for federated query processing on linked data
ISWC'11 Proceedings of the 10th international conference on The semantic web - Volume Part I
Enabling fine-grained HTTP caching of SPARQL query results
ISWC'11 Proceedings of the 10th international conference on The semantic web - Volume Part I
Improving the performance of semantic web applications with SPARQL query caching
ESWC'10 Proceedings of the 7th international conference on The Semantic Web: research and Applications - Volume Part II
FactForge: a fast track to the web of data
Semantic Web
Linked Data and Live Querying for Enabling Support Platforms for Web Dataspaces
ICDEW '12 Proceedings of the 2012 IEEE 28th International Conference on Data Engineering Workshops
Improving the recall of live linked data querying through reasoning
RR'12 Proceedings of the 6th international conference on Web Reasoning and Rule Systems
Hybrid SPARQL queries: fresh vs. fast results
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part I
Semantic-based QoS management in cloud systems: Current status and future challenges
Future Generation Computer Systems
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Querying over cached indexes of Linked Data often suffers from stale or missing results due to infrequent updates and partial coverage of sources. Conversely, live decentralised approaches offer fresh results directly from the Web, but exhibit slow response times due to accessing numerous remote sources at runtime. We thus propose a hybrid query approach that improves upon both paradigms, offering fresher results from a broader range of sources than Linked Data caches while offering faster results than live querying. Our hybrid query engine takes a cached and live query engine as black boxes, where a hybrid query planner splits an input query and delegates the appropriate sub-queries to each interface. In this paper, we discuss query planning alternatives and their main strengths and weaknesses. We also present coherence measures to quantify the coverage and freshness for cached indexes of Linked Data, and show how these measures can be used for hybrid query planning to optimise the trade-off between fresh results and fast runtimes.