Schema contains Core and Submission schema. Use for package validation. Set of packages. A container for project information that may be exchanged. May contain one or more single elements (i.e. one Project and one Submission) Information about owner and what to do with the package Owner of the package (host archive): NCBI, EMBL, DDBJ, ..... Package ID; Optional What to do with the package. Is it just info (eUnchanged), new data (eAdded), update of the existing data (eUpdated) or data to be deleted (eDeleted) Project core XML (see corresponding schema) Project submission XML (see corresponding schema) Unique for BioProject submission information, that is indicated in element Path in the main submission XML. For instance comments for DB staff in web submission form, etc. Project links XML (see corresponding schema) Project core XML. Currenty not used.