The category holdings_have_no_years is deceiving for a number of reasons -- it calls out valid holdings without years in them, holdings that are entirely supplements or indexes (from neither of which do we gather years), and holdings with years expressed in a non-Gregorian calendar, and holdings with years that are simply difficult to parse due to some formatting issue.
Instead of an error, we should add it to the header of an output column. This way we'll preserve the data when it's useful, without suggesting that it's inherently a problem.
The category
holdings_have_no_years
is deceiving for a number of reasons -- it calls out valid holdings without years in them, holdings that are entirely supplements or indexes (from neither of which do we gather years), and holdings with years expressed in a non-Gregorian calendar, and holdings with years that are simply difficult to parse due to some formatting issue.Instead of an error, we should add it to the header of an output column. This way we'll preserve the data when it's useful, without suggesting that it's inherently a problem.