Currently, the following fields are sent when creating datacite DOI :

• identifier (mandatory)
• creators (mandatory)
• titles (mandatory)
• publisher (mandatory)
• publishYear (mandatory)
• resourceType (mandatory)
• contributors
• dates (only "Issued" fill with the year only)
• sizes (datafile)
• fomats (datafile)
• relatedIdentifiers (datafile)
• description

Other fields can be add or impoved with the current object model of datasets and datafiles: language, geolocations, related items and identifier for dataset...