Dear PG-hackers, Based on the paper below [1], I ask: is there anyone working on, or already tried to such native implementation on PostgreSQL? I didn't find anything related on pgFoundry. There is also a presentation [2] related to the paper.
"By Souripriya Das, Eugene Inseok Chong, George Eadon, Jagannathan Srinivasan, Proceedings of the 30th VLDB Conference, Toronto, Canada. Ontologies are increasingly being used to build applications that utilize domain-specific knowledge. This paper addresses the problem of supporting ontology-based semantic matching in RDBMS. The approach enables users to reference ontology data directly from SQL using the semantic match operators, thereby opening up possibilities of combining with other operations such as joins as well as making the ontology-driven applications easy to develop and efficient. In contrast, other approaches use RDBMS only for storage of ontologies and querying of ontology data is typically done via APIs. This paper presents the ontology-related functionality including inferencing, discusses how it is implemented on top of Oracle RDBMS, and illustrates the usage with several database applications." [1] http://www.cs.toronto.edu/vldb04/protected/eProceedings/contents/pdf/IND3P1.PDF [2] http://www-scf.usc.edu/~csci586/ppt-2005/dguo.pps Besides, what are your opinions on the subject? Is it worthful to have such native implementation on PG, even as a modest contrib module? Based on your development know-how on the backend internals, how difficult is it to develop this (3 operators + 1 index type)? -- Best regards, Rodrigo Hjort http://icewall.org/~hjort CELEPAR - Cia de Informática do Paraná - Brasil http://www.pr.gov.br
