| Code | Display | Definition |
| primary | Primary title | Main title for common use. The primary title used for representation if multiple titles exist. |
| official | Official title | The official or authoritative title. |
| scientific | Scientific title | Title using scientific terminology. |
| plain-language | Plain language title | Title using language common to lay public discourse. |
| subtitle | Subtitle | Subtitle or secondary title. |
| short-title | Short title | Brief title (e.g. 'running title' or title used in page headers) |
| acronym | Acronym | Abbreviation used as title |
| earlier-title | Different text in an earlier version | Alternative form of title in an earlier version such as epub ahead of print. |
| language | Different language | Additional form of title in a different language. |
| autotranslated | Different language derived from autotranslation | Machine translated form of title in a different language, language element codes the language into which it was translated by machine. |
| human-use | Human use | Human-friendly title |
| machine-use | Machine use | Machine-friendly title |
| duplicate-uid | Different text for the same object with a different identifier | An alternative form of the title in two or more entries, e.g. in multiple medline entries |