Mandatory fields The identifier is missing. The Identifier is a unique string that identifies a resource. This field is mandatory. The identifier is: The type is missing. Check the metadata section and set the hierarchy level. This field is mandatory. The resource type is: The title is missing. A name or title by which a resource is known. May be the title of a dataset or the name of a piece of software. This field is mandatory. The title is: Publication year is missing. The year when the data was or will be made publicly available. Check publication date in resource identification. This field is mandatory. The publication date is: Creator is missing. The main researchers involved in producing the data, or the authors of the publication, in priority order. To supply multiple creators, repeat this property. Check point of contact in resource identification with role 'pointOfContact' or 'custodian'. This field is mandatory. creator(s) found. Publisher is missing. The name of the entity that holds, archives, publishes prints, distributes, releases, issues, or produces the resource. Check distribution section, the publisher is the first distributor contact. This field is mandatory. The publisher is: