Each PID requires metadata, or information about the person, thing or organization that the identifier is identifying, and different PIDs can be included in the metadata of other PIDs:
- ORCID iDs can be included in DOI metadata to identify the people involved in the existence of the object that the DOI is identifying.
- DOIs can be included in an ORCID record to identify the works that a person has produced, or the funding that a person has received.
- ROR IDs can be included in ORCID records to identify the organizations that an individual is affiliated with.
- ROR IDs can be included in DOI metadata to identify the organizations that are involved in the existence of the object that the DOI is identifying.
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