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CDL Name Assignment and Support Policy Statements

The CDL assigns identifiers within the ARK domain under the NAAN 13030 and according to the following principles:

  • No ARK shall be re-assigned; that is, once an ARK-to-object association has been made public, that association shall be considered unique into the indefinite future.
  • To help them age and travel well, the Name part of CDL-assigned ARKs shall contain no widely recognizable semantic information (to the extent possible).
  • CDL-assigned ARKs shall be generated with a terminal check character that guarantees them against single character errors and transposition errors.

Institutions that generate ARKs may want to follow similar principles or develop their own assignment policies.

Similarly, but in the role of an NMA and not an NAA, institutions will want to develop service commitment statements for their objects.

In developing such statements, it is useful to recognize first, that managing a digital object may require altering it as appropriate to ensure its stability, and second, that the declared level of commitment may change as the requirements and policies for persistence become better understood over time, and as the institution implements procedures and guidelines for maintaining the objects that it manages.