- The ARK Identifier Scheme Specification PDF version TXT version
- Towards Electronic Persistence Using ARK Identifiers (July 2003)
- ARK and CDL Identifier conventions
- Archival Resource Key - Wikipedia
- EZID service: long term identifiers made easy
- N2T resolver: Name-to-Thing
As with any identifier scheme, persistence requires a redirectable reference to content in stable storage. EZID operates on a cost-recovery basis and can be used to manage your namespace, which includes minting and resolving ARKs (and other identifiers), as well as maintaining metadata. There's is also guidance on CDL Identifier Conventions available.
Because long-term identifiers often look like random strings of letters and digits, organizations typically use software to generate (or mint, in ARK parlance) and track identifiers. To mint ARKs, you may use any software that can produce identifiers conforming to the ARK specification. CDL uses the open source Noid (nice opaque identifiers, rhymes with "employed") software, which creates minters and accepts commands that operate them. The noid software documentation explains how to use noid not only to mint identifiers but also to serve as an institution's "identifier resolver".
There is also information available about CDL Identifier Conventions.