CMOR uses Controlled Vocabularies as metadata constraints, with [CMIP6_CV.json](https://cmor.llnl.gov/mydoc_cmor3_CV/) being the main one. This has an effect on how the data is written in the files, variables' names, directory structure, filenames, and global attributes. The APP4 also relied on mapping files to match the raw model output to CMOR defined variables. To make this approach more flexible we introduced a new tool `mopdb` that helps the users create their own mapping and handling CMOR tables definitions.
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