XML, RDF or JSON conversion to tabular data

Dear All,
I know that this is really three questions in one. I need to quickly develop skills to manipulate and mine files in XML, RDF or JSON.
I am very familiar with the tidyverse and I have a smattering at the XML package.
What tools would you advice my to try?
And last but not least: where do I find some datasets (not entirely toy sets) to test them?
Many thanks!

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