[type of data: transcribed data (typed literal); not repeatable]
Optionally, if useful to the users of your collection, transcribe the date of publication, distribution, release, broadcast, etc., of the first manifestation of this expression following the name of the publisher, distributor, etc., preceded by a comma. If the date of publication, distribution, etc., does not appear, supply an accurate date in square brackets, if possible. If the item was never published or distributed, supply a date of production in square brackets, if applicable.
For continuing resources, if the expression is ongoing and not yet completed, use an open date, consisting of the beginning date of publication, followed by a hyphen. If the expression was published over a span of time, give the span of dates over which it was published.