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- In version 0, periods in field names were translated to underscores when writing to FITS, making it impossible to use underscores in field names. This was due to a misunderstanding of the FITS standard, and was never necessary. This translation is not done for version>0 schemas, and hence both periods and underscores will work with the code.
- In version>0, our naming conventions use underscores instead of the periods used in version 0. So while both are permitted by the code in version>0 (which allows us to read external FITS files with fewer restrictions, and note that periods will not be treated as a delimiter in version>0), only underscores should be used in LSST code, and underscores will now be used as the delimiter by the
SubSchemaclass andSchema::operator[]operator when joining pieces of field names.
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