A5087846752- Semantic Web and Ontologies
- Advanced Database Systems and Queries
- Service-Oriented Architecture and Web Services
- Logic, Reasoning, and Knowledge
- Data Quality and Management
- Data Management and Algorithms
- Access Control and Trust
- Biomedical Text Mining and Ontologies
- Scientific Computing and Data Management
- Natural Language Processing Techniques
- Cryptography and Data Security
- Educational and Social Studies
- Peer-to-Peer Network Technologies
- Business Process Modeling and Analysis
- Web Applications and Data Management
- Topic Modeling
- Privacy-Preserving Technologies in Data
- Web Data Mining and Analysis
- Education and Technology Integration
- Distributed and Parallel Computing Systems
- Experimental Learning in Engineering
- Information Technology Governance and Strategy
- E-Learning and Knowledge Management
- Educational Tools and Methods
- Health Literacy and Information Accessibility
Sapienza University of Rome
2015-2024
TU Wien
2004
In this paper we present MASTRO, a Java tool for ontology-based data access (OBDA) developed at Sapienza Università di Roma and the Free University of Bozen-Bolzano. MASTRO manages OBDA systems in which ontology is specified DL-LiteA,id ,
We present the framework of ontology-based data access, a semantic paradigm for providing convenient and user-friendly access to repositories, which has been actively developed studied in past decade. Focusing on relational sources, we discuss main ingredients key theoretical results, techniques, applications future challenges.
In databases with integrity constraints, data may not satisfy the constraints. this paper, we address problem of obtaining consistent answers in such a setting, when key and inclusion dependencies are expressed on database schema. We establish decidability complexity results for query answering under different assumptions (soundness and/or completeness). particular, after showing that is general undecidable, identify maximal class which decidable presence dependencies. Although obtained...
The task of an information integration system is to combine data residing at different sources, providing the user with a unified view them, called global schema. Users formulate queries over schema, and suitably answer user, who not obliged have any about sources. Recent developments in IT such as expansion Internet World Wide Web, made available users huge number generally autonomous, heterogeneous widely distributed: consequence, has emerged crucial issue many application domains, e.g.,...
In ontology-based data access (OBDA), an ontology is connected to autonomous, and generally pre-existing, repositories through mappings, so as provide a high-level, conceptual view over such data. User queries are posed the ontology, answers computed by reasoning both on mappings. Query answering in OBDA systems typically performed query rewriting approach which divided into two steps: (i) rewritten with respect (ontology of query); (ii) thus obtained then reformulated database schema using...
Ontology-based data access (OBDA) is a novel paradigm for accessing large repositories through an ontology, that formal description of domain interest. Supporting the management OBDA applications poses new challenges, as it requires to provide effective tools (i) allowing both expert and non-expert users analyze specification, (ii) collaboratively documenting (iii) exploiting services, such query answering automated reasoning over ontologies, e.g., support quality check, (iv) tuning...
Data exchange and virtual data integration have been the subject of several investigations in recent literature. At same time, notion peer management has emerged as a powerful abstraction many forms flexible dynamic data-centere ddistributed systems. Although research on above issues progressed considerably last years, clear understanding how to combine is still missing. This present paper. We start our investigation by first proposing novel framework for exchange, showing that it...