UMLS (Unified Medical Language System) code systems are supported by Snow Owl in read-only mode. To obtain the UMLS content to be imported, please visit their website and download the
Full Releasearchive. The full release includes their
NLM MetamorphoSystooling, which allows the creation of a customized subset with only the code systems required to be imported to Snow Owl. When selecting the export format for the code systems, choose the RRF files. Once the files are created by the
NLM MetamorphoSystooling, the results need to be archived in a standard zip file.