FUJI-F1-04

This tests verifies if the persistent identifier of the data has been registered by a PID authority. To do so, the test evaluates if the PID correspond to the following authorities: Crossref, DataCite, Europe PubMed Central, PubMed Central, arXiv.org e-Print Archive, and the Protein Data Bank.

Source: Since FAIROS uses [F-UJI](https://f-uji.net) to assess a Research Object, this test is an instance of the test **FsF-F1-02MD-2**. You can find more information in the european project FAIR IMPACT(https://fair-impact.eu/metrics-data).