Given an annotation object, this function returns a CoNLL-U
document. The format of CoNLL-U is close to that of a deliminated
file, but includes blank lines to signal breaks between sentences.
We return a string object that can be saved to disk using the
function readLines
. Note that CoNLL-U does not have a way
of distinguishing documents. Usually only one document is written
to a single file. If you want this behavior, see the examples.
Also note that this is a lossy procedure depending on the
annotations available, saving just tokenization, lemmatization,
part of speech tags, and dependencies.