This document provides practical guidance on representing persistent identifiers in ISO 19115-3 metadata records for research projects and datasets. It focuses on where and how to record DOI, ROR, ORCID, and RAiD identifiers in ISO metadata, and documents associated community conventions used within the National Environmental Science Program Marine and Coastal (NESP MaC) Hub to support consistency, interoperability, and downstream harvesting.

The guide includes encoding guidance, conventions for metadata structure and citation practice, identifier-specific guidance, and XML examples to support implementation in ISO 19115-3 metadata records. Although it is based on workflows used by IMAS and eAtlas within the NESP MaC Hub, the guidance is broadly applicable to other organisations seeking consistent, standards-aligned metadata practices.

This guide was developed through the NESP MaC Hub and ARDC co-funded project “Enhancing Discoverability and Impact: Standardising NESP Marine and Coastal Data with Persistent Identifiers" ( https://doi.org/10.3565/pkjc-z984) as part of the Domain Data Portals program.