Project CHIO defined 21 access points which it saw as key for categorising museum information:
| bibliography | concept | copyright.restrictions |
| credit-line | date-range | event |
| identity-number | inscription.mark | material |
| nationality.culture.race | object | occupation |
| organization | person | place |
| process.technique | quote | styles.movements |
| subject | title.name | type.classification |