These are files that contain the model content in formats alternative to the authoritative XML Schemas. These are provided for developers who wish to import the model content without having to parse the schemas.
These materials are different from the spreadsheets in the release package. The other spreadsheets are formatted to provide user-readable documentation. These files are formatted to be machine-readable, so that the contents may be easily imported.
For each format, there is an item (a file, tab, or table) that lists:
On GitHub, the CSV formats are located in the csv
directory off the root. The release page on release.niem.gov contains all three formats - CSVs, the spreadsheet, and the Access database.
Below is a snapshot from the Property CSV: