| HeaderData | Container for data required to generate OAI-PMH resource's header. |
| MetadataFormat | Container for OAI-PMH metada format data |
| RepositoryInfo | Container for OAI-PMH repository information |
| SetInfo | Simple container for OAI-PMH set data (https://www.openarchives.org/OAI/openarchivesprotocol.html#Set) |