A graphical query language supporting recursion
SIGMOD '87 Proceedings of the 1987 ACM SIGMOD international conference on Management of data
Flexible queries over semistructured data
PODS '01 Proceedings of the twentieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Logic for Applications
Approximating Terminological Queries
FQAS '02 Proceedings of the 5th International Conference on Flexible Query Answering Systems
Information-Need Driven Query Refinement
WI '03 Proceedings of the 2003 IEEE/WIC International Conference on Web Intelligence
A Logic-Based Approach for Query Refinement in Ontology-Based Information Retrieval S
ICTAI '04 Proceedings of the 16th IEEE International Conference on Tools with Artificial Intelligence
Foundations of semantic web databases
PODS '04 Proceedings of the twenty-third ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Imprecise RDQL: towards generic retrieval in ontologies using similarity joins
Proceedings of the 2006 ACM symposium on Applied computing
OWL-QL-a language for deductive query answering on the Semantic Web
Web Semantics: Science, Services and Agents on the World Wide Web
Data access and integration in the ISPIDER proteomics grid
DILS'06 Proceedings of the Third international conference on Data Integration in the Life Sciences
A relaxed approach to RDF querying
ISWC'06 Proceedings of the 5th international conference on The Semantic Web
Robust query processing for personalized information access on the semantic web
FQAS'06 Proceedings of the 7th international conference on Flexible Query Answering Systems
An Evolutionary Perspective on Approximate RDF Query Answering
SUM '08 Proceedings of the 2nd international conference on Scalable Uncertainty Management
Ranking Approximate Answers to Semantic Web Queries
ESWC 2009 Heraklion Proceedings of the 6th European Semantic Web Conference on The Semantic Web: Research and Applications
Relaxing RDF queries based on user and domain preferences
Journal of Intelligent Information Systems
Combining approximation and relaxation in semantic web path queries
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
Guided creation and update of objects in RDF(S) bases
Proceedings of the sixth international conference on Knowledge capture
Query relaxation for entity-relationship search
ESWC'11 Proceedings of the 8th extended semantic web conference on The semanic web: research and applications - Volume Part II
Generalizing conjunctive queries for informative answers
FQAS'11 Proceedings of the 9th international conference on Flexible Query Answering Systems
Towards fuzzy query-relaxation for RDF
ESWC'12 Proceedings of the 9th international conference on The Semantic Web: research and applications
An interactive guidance process supporting consistent updates of RDFS graphs
EKAW'12 Proceedings of the 18th international conference on Knowledge Engineering and Knowledge Management
Query driven hypothesis generation for answering queries over NLP graphs
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part II
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We explore flexible querying of RDF data, with the aim of making it possible to return data satisfying query conditions with varying degrees of exactness, and also to rank the results of a query depending on how "closely" they satisfy the query conditions. We make queries more flexible by logical relaxation of their conditions based on RDFS entailment and RDFS ontologies. We develop a notion of ranking of query answers, and present a query processing algorithm for incrementally computing the relaxed answer of a query. Our approach has application in scenarios where there is a lack of understanding of the ontology underlying the data, or where the data objects have heterogeneous sets of properties or irregular structures.