| `date` | Creation date – takes precedence over the file date |
| `tags` | List of tags attached to this note |
| `keywords` | Alias for `tags` |
| `aliases` | Alternative titles for this note, used by `--mention` |
All metadata are indexed and can be printed in `zk list` output, using the template variable `{{metadata.<key>}}`, e.g. `{{metadata.description}}`. The keys are normalized to lower case.