XML-based information mediation with MIX
SIGMOD '99 Proceedings of the 1999 ACM SIGMOD international conference on Management of data
Reconciling schemas of disparate data sources: a machine-learning approach
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
Schema-Driven Evaluation of Approximate Tree-Pattern Queries
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
Generic Schema Matching with Cupid
Proceedings of the 27th International Conference on Very Large Data Bases
Answering XML Queries on Heterogeneous Data Sources
Proceedings of the 27th International Conference on Very Large Data Bases
Selected papers from the Third International Workshop WebDB 2000 on The World Wide Web and Databases
A Semantic Approach to XML-based Data Integration
ER '01 Proceedings of the 20th International Conference on Conceptual Modeling: Conceptual Modeling
DBGlobe: a service-oriented P2P system for global computing
ACM SIGMOD Record
Containment and equivalence for a fragment of XPath
Journal of the ACM (JACM)
XIRQL: An XML query language based on information retrieval concepts
ACM Transactions on Information Systems (TOIS)
The Piazza Peer Data Management System
IEEE Transactions on Knowledge and Data Engineering
FleXPath: flexible structure and full-text querying for XML
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Constraint-based XML query rewriting for data integration
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Efficient query reformulation in peer data management systems
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Structure and content scoring for XML
VLDB '05 Proceedings of the 31st international conference on Very large data bases
HePToX: marrying XML and heterogeneity in your P2P databases
VLDB '05 Proceedings of the 31st international conference on Very large data bases
Query translation scheme for heterogeneous XML data sources
Proceedings of the 7th annual ACM international workshop on Web information and data management
Integrating XML data sources using approximate joins
ACM Transactions on Database Systems (TODS)
XSKETCH synopses for XML data graphs
ACM Transactions on Database Systems (TODS)
COMA: a system for flexible combination of schema matching approaches
VLDB '02 Proceedings of the 28th international conference on Very Large Data Bases
Structure-based inference of xml similarity for fuzzy duplicate detection
Proceedings of the sixteenth ACM conference on Conference on information and knowledge management
The Active XML project: an overview
The VLDB Journal — The International Journal on Very Large Data Bases
XML duplicate detection using sorted neighborhoods
EDBT'06 Proceedings of the 10th international conference on Advances in Database Technology
Vague queries on peer-to-peer XML databases
DEXA'07 Proceedings of the 18th international conference on Database and Expert Systems Applications
Top-k Answers to Fuzzy XPath Queries
DEXA '09 Proceedings of the 20th International Conference on Database and Expert Systems Applications
On the expressiveness of generalization rules for XPath query relaxation
Proceedings of the Fourteenth International Database Engineering & Applications Symposium
Retrieving samples from biobanks
ITBAM'10 Proceedings of the First international conference on Information technology in bio- and medical informatics
Intuitionistic fuzzy XML query matching
FQAS'11 Proceedings of the 9th international conference on Flexible Query Answering Systems
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We propose a framework for querying heterogeneous XML data sources. The framework ensures high autonomy to participating sources as it does not rely on a global schema or on semantic mappings between schemas. The basic intuition is that of extending traditional approaches for approximate query evaluation, by providing techniques for combining partial answers coming from different sources, possibly on the basis of limited knowledge about the local schemas (i.e., key constraints). We define a query language and its associated semantics, that allows us to collect as much information as possible from several heterogeneous XML sources. We provide algorithms for query evaluation and characterize the complexity of the query language. Finally, we validate the approach in a medical application scenario.