> For the complete documentation index, see [llms.txt](https://coartraining.gitbook.io/coar-repository-toolkit/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://coartraining.gitbook.io/coar-repository-toolkit/interoperability/persistent-identifiers.md).

# Persistent identifiers

"A Persistent IDentifier (PID) is a long-lasting reference to a resource, registered at an agreed location. Often, a PID is associated to a set of metadata describing the object." (THOR Project-NCDD)

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Jonathan Clark: What are Persistent Identifiers and Why are they Important?
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Tutorial: DSpace (12 from 16) - implement ORCID on DSpace
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