According to the publication_schema.json, the minimum number of items for authors is 1. The minOccurs in the dats.xsd for the element authors of type Publication is 0. The publication_schema.json does not indicate it is required at the bottom of the page.
According to the publication_schema.json, the minimum number of items for authors is 1. The minOccurs in the dats.xsd for the element authors of type Publication is 0. The publication_schema.json does not indicate it is required at the bottom of the page.