| Article | Representation of a general article |
| BiblioBase | An abstract base for other biblio classes |
| Book | Representation of a book |
| BookArticle | Representation of a book article |
| IO | Handling the bibliographic references |
| Journal | Representation of a journal |
| JournalArticle | Representation of a journal article |
| MedlineArticle | Representation of a MEDLINE article |
| MedlineBook | Representation of a MEDLINE book |
| MedlineBookArticle | Representation of a MEDLINE book article |
| MedlineJournal | Representation of a MEDLINE journal |
| MedlineJournalArticle | Representation of a MEDLINE journal article |
| Organisation | Representation of an organisation |
| Patent | Representation of a patent |
| Person | Representation of a person |
| Proceeding | Representation of a conference proceeding |
| Provider | Representation of a general provider |
| PubmedArticle | Representation of a PUBMED article |
| PubmedBookArticle | Representation of a PUBMED book article |
| PubmedJournalArticle | Representation of a PUBMED journal article |
| Ref | Representation of a bibliographic reference |
| Service | Representation of a provider of type service |
| TechReport | Representation of a technical report |
| Thesis | Representation of thesis |
| WebResource | Representation of a web resource |