View 1 highlevel data access 2 query rewriting 3 ontologybased data 4 semantic web 5 data sources 6 obda systems 7 sql queries 8 knowledge representation text PowerPoint (PPT) presentations online in SlideServe. SlideServe has a very huge collection of 1 highlevel data access 2 query rewriting 3 ontologybased data 4 semantic web 5 data sources 6 obda systems 7 sql queries 8 knowledge representation text PowerPoint presentations. You can view or download 1 highlevel data access 2 query rewriting 3 ontologybased data 4 semantic web 5 data sources 6 obda systems 7 sql queries 8 knowledge representation text presentations for your school assignment or business presentation. Browse for the presentations on every topic that you want.