When plotting and filtering, it is often useful to plot the number of observations for each taxon using n_obs or n_obs_1. However, since these require a dataset to be specified, they are not in the NSE list. If a default is added, then they could be used with NSE. Either:
1) If there is one dataset, use that, otherwise error
or
2) Always use the first dataset, error if there are none.
When plotting and filtering, it is often useful to plot the number of observations for each taxon using
n_obsorn_obs_1. However, since these require a dataset to be specified, they are not in the NSE list. If a default is added, then they could be used with NSE. Either:1) If there is one dataset, use that, otherwise error
or
2) Always use the first dataset, error if there are none.