Set of test-cases depending on the input data format

[dachafra]

Idea proposed by @andimou.

It is somewhat unusual that the test cases are not available across all formats for RML-Core. To increase flexibility, an interesting approach would be to define different sets of test cases depending on the input data format. For instance, one could cover RML-Core with CSV but not necessarily with JSON, and so on.

The idea would therefore be to ensure that there is at least one set of RML-Core test cases for each format supported by RML-IO: CSV, XML, JSON, and SQL.

[chrdebru]

I agree. Given the decisions made two years ago, that should be part of IO, correct? We have made rml-core "JSON-only." Including those test cases here would require/assume that RML core supports the others.

[dachafra]

The idea is to generate test cases for RML-Core, but not all of them will be mandatory, so developers can decide the input data format.