The “Crossref Display Guidelines (March 2017)", retrieved 2021-12-09, DOI display guidelines - Crossref say that https://doi/org is only for “Crossref DOIs, not anyone else’s DOIs, as not all DOIs are made equal.”
Neither this page nor the linked membership page clearly explain how to identify a Crossref DOI vs any other possible DOI.
An example URL is given, https://doi.org/10.xxxx/xxxxx which seems to imply that:
- All Crossref DOIs begin with “10.”
- No non-Crossref DOIs begin with “10.”
Are both of these statements true? If not, what additional information do I need to reliably identify Crossref DOIs.
I am working on scripting to automate conversion of references (in papers we publish) that include “doi:…” identifiers. I do not want to inadvertently convert to https://doi.org/ any doi: identifiers that do not “belong” to Crossref.