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Use of "Rabbit in a Hat" output (json) in the ETL process


The first times in my OMOP CDM days, I’ve used “Rabbit in a Hat” to get to know OMOP CDM and its structure. After mapping a registry dataset in “Rabbit in a Hat” I realized that you can also export the mapping in a json file. Now I wanted to use that json file in my ETL tool (Talend Open Studio) - but it turned out to be trickier than expected.
Has either of you used the json file from RiaH in an ETL before? Thanks in advance!