Thanks for the reply, it is all clear now.
One last question regarding the dates. If I look for a DOI with the search engine in XML format, for instance, DOI 10.1039/d0se01062f, I can see a publication_date field (29 September 2020). However, in the public data file, the JSON for that DOI includes several date fields like indexed, created, published-online, issued, deposited. Some of them like issued or published-online have only the year part. What is the field in the public data file JSON that should correspond to the publication date?