(19 Aug 2026) Research is no longer found only through journal pages and conventional indexes. The same work may appear on a preprint server, a publisher platform, an institutional repository, a scholarly index, a licensed AI collection, and eventually inside generated summaries or answers. AI systems may retrieve passages from any of these places, split the content into chunks, and reuse claims without taking the reader back through the context shown on the original article page.
Version ambiguity is therefore becoming more than a discovery problem. It is becoming a provenance problem.
Consider three common situations: A preprint may go through several revisions before journal publication. A Version of Record may be corrected or retracted, while repository copies and downstream indexes still hold the earlier text or fail to reflect its changed status. In post-publication peer review, an article may move through several reviewed and revised states before, or instead of, reaching a conventional Version of Record.
In each case, PIDs are critical for keeping the research record connected. But identifiers alone may not tell a researcher, an index, or an AI system which state of the work was actually used.
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