DOC: why is sources files not a param on the cli?

[pvgenuchten]

This is typically a newbee question, but improving docs will help next generation of newbee's.
I was struggling with the fact that i couldn't understand the syntax of the cli, that it didn't have a sources(path) parameter
Until i realised that the mappingfile itself has references to the sources files. My suggestion is to dedicate a paragraph to this on the cli-help

On the other hand, would-it be interesting to have an optional parameter -sources, which would override the sources-parameters in the mapping file. a scenario is that you have multiple sets of files (sharing a model) and you want to run the mapper on each of them with a script. challenging off course is how to map a file to a mapping

[bjdmeest]

Thanks for the issue! The general idea is that all mapping configuration is part of the RML mapping, to make it self-contained. However, as RMLMapper-java supports multiple mapping inputs, you could configure a first mapping without reference to the actual source, and add a second mapping that just links your first mapping to a specific source, I gave an example at #161 (comment). Please let us know if that helps! I will keep this issue open to remember us to improve the documentation ;).