Acquisition of OWL DL Axioms from Lexical Resources
ESWC '07 Proceedings of the 4th European conference on The Semantic Web: Research and Applications
Semantics and complexity of SPARQL
ACM Transactions on Database Systems (TODS)
Learning concept hierarchies from text corpora using formal concept analysis
Journal of Artificial Intelligence Research
Learning highly structured semantic repositories from relational databases: the RDBToOnto tool
ESWC'08 Proceedings of the 5th European semantic web conference on The semantic web: research and applications
Foundations of SPARQL query optimization
Proceedings of the 13th International Conference on Database Theory
Ontology and database mapping: a survey of current implementations and future directions
Journal of Web Engineering
Enabling Linked Data access to the Internet of Things
Proceedings of International Conference on Information Integration and Web-based Applications & Services
Formal Linked Data Visualization Model
Proceedings of International Conference on Information Integration and Web-based Applications & Services
Optimizing SPARQL-to-SQL Rewriting
Proceedings of International Conference on Information Integration and Web-based Applications & Services
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This chapter surveys knowledge extraction approaches from structured sources such as relational databases, XML and CSV. A general definition of knowledge extraction is devised that covers structured as well as unstructured sources. We summarize current progress on conversion of structured data to RDF and OWL. As an example, we provide a formalization and description of SparqlMap, which implements the relational database to RDF mapping language R2RML currently being standardized by the W3C.