An Archival Resource Key (ARK) is a Uniform Resource Locator (URL) that is a multi-purpose persistent identifier for information objects of any type.

Prefix
ark
Links
Homepage
Contact
Missing Contact
Pattern for Local Unique Identifiers

Local identifiers in Archival Resource Key should match this regular expression:
^/*[0-9A-Za-z]+(?:/[\w/.=*+@\$-]*)?(?:\?.*)?$

Example Local Unique Identifier
/12345/fk1234   Resolve
Pattern for CURIES

Compact URIs (CURIEs) constructed from Archival Resource Key should match this regular expression:
^ark:/*[0-9A-Za-z]+(?:/[\w/.=*+@\$-]*)?(?:\?.*)?$

Example CURIE
ark:/12345/fk1234
MIRIAM Namespace Embedded in LUI
The legacy MIRIAM standard for generating CURIEs with this resource includes the namespaceEmbeddedInLUI as true. The actual part that gets prefixed before the local unique identifier regex, otherwise known as the banana, is ark:. Therefore, you might see local unique identifiers written out as CURIEs.
Metaregistry

The metaregistry provides mappings between the Bioregistry and other registries. There are 3 mappings to external registries for ark.

Registry Name Metaprefix External Prefix
Identifiers.org miriam ark
Name-to-Thing n2t ark
Prefix Commons prefixcommons ARK
Providers

Providers are various services that resolve CURIEs to URLs. The example CURIE ark:/12345/fk1234 is used to demonstrate the provides available for ark. Generation of OLS and BioPortal URLs requires additional programmatic logic beyond string formatting.

Name Metaprefix URI
Archival Resource Key ark http://n2t.net/ark:/12345/fk1234
Bioregistry bioregistry https://bioregistry.io/ark:/12345/fk1234
Identifiers.org miriam https://identifiers.org/ark:/12345/fk1234
Name-to-Thing n2t https://n2t.net/ark:/12345/fk1234