Get names of available data used in expressions. This is used to find data for use with non-standard evaluation (NSE) in functions like filter_taxa(). Expressions are not evaluated and do not need to make sense.
filter_taxa()
obj$names_used(...)
a taxonomy() or taxmap() object
taxonomy()
taxmap()
One or more expressions
Named character
character
Other NSE helpers: all_names, data_used, get_data
all_names
data_used
get_data
# NOT RUN { ex_taxmap$names_used(n_legs + dangerous == invalid_expression) # }
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