Fixpoint iteration with subsumption in deductive databases
Journal of Intelligent Information Systems - Special issue: deductive and object-oriented databases
Term rewriting and all that
FLEX: A Tolerant and Cooperative User Interface to Databases
IEEE Transactions on Knowledge and Data Engineering
A Declarative Approach to Active Databases
Proceedings of the Eighth International Conference on Data Engineering
Proceedings of the Third Workshop on Information Systems and Artificial Intelligence: Management and Processing of Complex Data Structures
Preferences; Putting More Knowledge into Queries
VLDB '87 Proceedings of the 13th International Conference on Very Large Data Bases
Preference formulas in relational queries
ACM Transactions on Database Systems (TODS)
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
Foundations of semantic web databases
PODS '04 Proceedings of the twenty-third ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Foundations of preferences in database systems
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Preference SQL: design, implementation, experiences
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Personalizing access to learning networks
ACM Transactions on Internet Technology (TOIT)
Journal on data semantics X
REASE: the repository for learning units about the semantic web
The New Review of Hypermedia and Multimedia - Special issue: Observing users of digital educational technologies
Reasoning with conditional ceteris paribus preference statements
UAI'99 Proceedings of the Fifteenth conference on Uncertainty in artificial intelligence
A relaxed approach to RDF querying
ISWC'06 Proceedings of the 5th international conference on The Semantic Web
A framework for browsing, manipulating and maintaining interoperable learner profiles
UM'05 Proceedings of the 10th international conference on User Modeling
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
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
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
Efficiently evaluating skyline queries on RDF databases
ESWC'11 Proceedings of the 8th extended semantic web conference on The semanic web: research and applications - Volume Part II
Towards fuzzy query-relaxation for RDF
ESWC'12 Proceedings of the 9th international conference on The Semantic Web: research and applications
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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 such that they return the intended result. Due to lacking knowledge about 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 article, we investigate methods for automatically relaxing such over-constrained 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 resource description framework data as well as an implementation in terms of rewriting rules and explain its application in the context of e-learning systems.