string giving the model namel.
Defaults to "english" if NULL.
Ignored if model_path is not NULL.
model_path
provide a full path to a model file.
feature_flag
boolean. Should universal features be
included in the output.
parser
a character string of length 1, which is
either 'default' (default udpipe dependency
parsing) or 'none' (no dependency parsing needed)
or a character string with more complex parsing
options