Conceptual Schema Transformation in Ontology-Based Data Access

Diego Calvanese, Tahir Emre Kalayci, Marco Montali, Ario Santoso, Wil van der Aalst

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


Ontology-based Data Access (OBDA) is a by now well-established paradigm that relies on conceptually representing a domain of interest to provide access to relational data sources. The conceptual representation is given in terms of a domain schema (also called an ontology), which is linked to the data sources by means of declarative mapping specifications, and queries posed over the conceptual schema are automatically rewritten into queries over the sources. We consider the interesting setting where users would like to access the same data sources through a new conceptual schema, which we call the upper schema. This is particularly relevant when the upper schema is a reference model for the domain, or captures the data format used by data analysis tools. We propose a solution to this problem that is based on using transformation rules to map the upper schema to the domain schema, building upon the knowledge contained therein. We show how this enriched framework can be automatically transformed into a standard OBDA specification, which directly links the original relational data sources to the upper schema. This allows us to access data directly from the data sources while leveraging the domain schema and upper schema as a lens. We have realized the framework in a tool-chain that provides modeling of the conceptual schemas, a concrete annotation-based mechanism to specify transformation rules, and the automated generation of the final OBDA specification
Original languageEnglish
Title of host publicationKnowledge Engineering and Knowledge Management
Subtitle of host publication21st International Conference, EKAW 2018, Nancy, France, November 12-16, 2018, Proceedings
ISBN (Electronic)978-3-030-03667-6
Publication statusPublished - 2018
Event21st International Conference on Knowledge Engineering and Knowledge Management: EKAW 2018 - Inria, Nancy, France
Duration: 12 Nov 201816 Nov 2018

Publication series

NameLecture Notes in Computer Science
PublisherSpringer, Cham


Conference21st International Conference on Knowledge Engineering and Knowledge Management
Abbreviated titleEKAW 2018
Internet address


  • Conceptual schema transformation
  • Ontology-based data access
  • Ontology-to-ontology mapping

ASJC Scopus subject areas

  • Information Systems


Dive into the research topics of 'Conceptual Schema Transformation in Ontology-Based Data Access'. Together they form a unique fingerprint.

Cite this