- I found that [Crossref's metadata is in the public domain under the CC0 license](https://www.crossref.org/documentation/retrieve-metadata/rest-api/rest-api-metadata-license-information/)
- One interesting thing is the abstracts, which are copyrighted by the copyright owner, meaning Crossref cannot waive the copyright under the terms of the CC0 license, because it is not theirs to waive
- We can be on the safe side by using only abstracts for items that are licensed under Creative Commons
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- This GREL extracts the _text_ content of the `<jats:p>` tags (ie, no other JATS XML markup tags like `<jats:i>`, `<jats:sub>`, etc):
- Some discussion this week about issue and online dates for journal articles, with regards to PRMS
- I looked more closely at the [Crossref API docs](https://github.com/CrossRef/rest-api-doc/blob/master/api_format.md) and realized (again) that their "issue" date is not the same as our issue date—they take the earlier of the print and online dates!
- Also, *very many* items have no print date at all, perhaps due to delays, errors, or simply because the journal is "online only"!
- I suggested again that PRMS should consider both, and take the earlier of the two, then make sure whether the date is in the current reporting period
- I managed to find 80 items with print publishing dates from 2023 and updated those from Crossref, but for the rest we will have to think about how we handle them
- More discussion about dates after looking closely at them yesterday and today
- Crossref doesn't always have both issued and online dates—sometimes they have one, sometimes the other, and sometimes both, so we cannot rely on them 100% for that.
- In some cases, the item is available online for months (or even a year!), but has not been included in an issue yet, and thus has no "issue" date, for example: