In the proposal to the chapter on MS Description, in
paragraph '4.42 origin' the sample indicates that the
attributes 'notBefore' and 'notAfter' may contain a
year, but then I try with the prelimilary version of
P5, these attributes have to have full dates as values,
for instance '1802-01-01', and not only '1802'. I would
guess that the values of these attributes should
include a year as well as a complete date.