Term rewriting and all that
Optimal aggregation algorithms for middleware
PODS '01 Proceedings of the twentieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Active Rules in Database Systems
Active Rules in Database Systems
FLEX: A Tolerant and Cooperative User Interface to Databases
IEEE Transactions on Knowledge and Data Engineering
Approximating Terminological Queries
FQAS '02 Proceedings of the 5th International Conference on Flexible Query Answering Systems
A Declarative Approach to Active Databases
Proceedings of the Eighth International Conference on Data Engineering
Optimizing Multi-Feature Queries for Image Databases
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
Preferences; Putting More Knowledge into Queries
VLDB '87 Proceedings of the 13th International Conference on Very Large Data Bases
Evaluating Top-k Queries over Web-Accessible Databases
ICDE '02 Proceedings of the 18th International Conference on Data Engineering
Exploring Large Document Repositories with RDF Technology: The DOPE Project
IEEE Intelligent Systems
Personalization in distributed e-learning environments
Proceedings of the 13th international World Wide Web conference on Alternate track papers & posters
Preference SQL: design, implementation, experiences
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Scalable instance retrieval for the semantic web by approximation
WISE'05 Proceedings of the 2005 international conference on Web Information Systems Engineering
Semantic and Conceptual Context-Aware Information Retrieval
Advanced Internet Based Systems and Applications
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
Finding Top-k Approximate Answers to Path Queries
FQAS '09 Proceedings of the 8th International Conference on Flexible Query Answering Systems
Improving the accuracy of job search with semantic techniques
BIS'07 Proceedings of the 10th international conference on Business information systems
Journal on data semantics X
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Research in Cooperative Query answering is triggered by the observation that users are often not able to correctly formulate queries to databases that return the intended result. Due to a lack of knowledge of the contents and the structure of a database, users will often only be able to provide very broad queries. Existing methods for automatically refining such queries based on user profiles often overshoot the target resulting in queries that do not return any answer. In this paper, we investigate methods for automatically relaxing such over-constraint queries based on domain knowledge and user preferences. We describe a framework for information access that combines query refinement and relaxation in order to provide robust, personalized access to heterogeneous RDF data as well as an implementation in terms of rewriting rules and explain its application in the context of e-learning systems.