Persistent identifiers
Persistent identifiers (also known as PIDs) are stable, long-lasting references to resources. Even if the (digital) location of a resource changes, the aim of a persistent identifier is to continue resolving it (to the new location), making sure the resource remains accessible over time.
To fully leverage the benefits of PIDs, we aim to increase their adoption and use among data partners. This documentation sets out the expectations of the data space for how PIDs should be implemented and provided in the metadata. It also outlines the steps we are taking to ensure that, when PIDs are supplied, we make the full use of their potential.
To support this effort, the following pages offer guidance on understanding, adopting, effectively implementing and providing PIDs within the data space:
One example of a PID in use is the one assigned to the portrait of Mona Lisa (La Joconde), held by the Louvre, via the ARK (Archival Resource Key) scheme: ark:/53355/cl010066723
ARK identifiers can be resolved through the N2T (Name to Thing) resolution service, which creates a clickable link from the identifier: https://n2t.net/ark:/53355/cl010066723
Clicking on the link redirects users to the Louvre’s landing page for the painting, where the digitised object is shown along with information about the painting:
Because ARK PID is maintained through a stable and reliable infrastructure, the Mona Lisa will remain findable and identifiable online, even if the Louvre reorganises or relocates its online content. This is one of the key advantages of using persistent identifiers: they help prevent broken links (link rot). They also make it possible to track where and how resources like Mona Lisa are being used and some systems can even provide usage statistics. In addition, PIDs support proper attribution and citation, ensuring that contributing organisations are clearly acknowledged.