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Related Work

OpenURL has not been replaced. Adjacent work — IOTA on link quality, KBART on knowledge bases, direct linking through DOI — shapes the environment in which it continues to operate.

NISO IOTA

Improving OpenURLs Through Analytics (IOTA) was a NISO working group that studied the quality of OpenURL traffic for about three years. It analysed more than 23 million OpenURLs from resolver logs and developed a Completeness Index that scores how likely a source's OpenURLs are to produce working full-text links, based on which elements they contain. In June 2013 NISO published the results as a recommended practice, IOTA: Recommendations for Link Resolver Providers (NISO RP-21-2013), and a technical report, IOTA Working Group Summary of Activities and Outcomes (NISO TR-05-2013).

KBART

Knowledge Bases And Related Tools (NISO RP-9; see OpenURL & KBART) deals with the other half of link quality: the holdings data in the resolver's knowledge base. Better KBART data improves resolution without changing the OpenURL. The current version is NISO RP-9-2026 (Phase III).

Direct linking

Scholarly publishing has moved toward identifier-first linking: DOIs are the normal way to cite articles, and repositories such as arXiv and PubMed have their own stable identifiers. Where every reference has a DOI, "which copy?" partly reduces to "where does the DOI resolve?" But the DOI goes to the publisher's version whatever the reader's entitlements. The institutional question, and with it the link resolver, remains.

Why OpenURL is still in use

  • Citations without identifiers. Older articles, books, chapters, dissertations and grey literature often have no DOI. OpenURL's metadata form is the standard way to carry them.
  • Institutional context. Identifiers do not encode subscription state. OpenURL's separation of the citation from the destination is what the appropriate-copy problem needs.
  • Installed base. Major resolvers accept OpenURL and major databases and discovery systems emit it.

Z39.88-2004 was reaffirmed in 2010 and remains a current NISO standard; its Registry has been frozen since 2022. OpenURL is mature: stable, little changed, and still carrying a large share of library linking.

Sources