FAQ

Table of Contents The Protege Plugins complains: No suitable driver found for .. (driver) Protege does not show the Ontop tabs! Casing problems with SQL identifiers What is the mapping syntax? How can I start using -ontop-? How Do I use ontop together with Protege? What does -ontop- support regarding SQL and SPARQL? What is the difference between Quest and -ontop-? How fast is -ontop- compared to the rest? Is it also open source? How can I report a bug or ask other questions?

The Protege Plugins complains: No suitable driver found for .. (driver)

You need to download and install the right driver in Protege. See Setting up JDBC Drivers and JDBC Information

Protege does not show the Ontop tabs!

To see the tabs go to Windows-> tabs-> Ontop Mappings and Ontop SPARQL.

Casing problems with SQL identifiers

If you experience the following error message: "Error in identifying column name", it may be due to casing problems with the SQL identifiers used in your mappings. See this dedicated page.

What is the mapping syntax?

To learn the mapping language [page](https://github.com/ontop/ontop/wiki/ObdalibQuestMappinglanguage). To see how to produce efficient mappings (under construction.)

How can I start using -ontop-?

We recommend to Start following an easy example: this example

How Do I use ontop together with Protege?

See this page.

What does -ontop- support regarding SQL and SPARQL?

See the known issues and limitations here

What is the difference between Quest and -ontop-?

Quest is the reasoner behind -ontop-. -ontop- is the whole framework. For more information check more info about Quest

How fast is -ontop- compared to the rest?

Very fast! See our Benchmarks.

Is it also open source?

Yes! The -ontop- framework is available under the Apache License, Version 2.0

How can I report a bug or ask other questions?

Send us an email to our mailing list: https://groups.google.com/d/forum/ontop4obda .