==== DOI ====

“The DOI (Digital Object Identifier) is an international standard (ISO 26324) managed by the International DOI Foundation, which provides a system to support persistent identification of content objects and related entities in digital networks.”

  * https://doi.org
  * https://www.crossref.org/services/content-registration/
  * https://www.doi.org/the-community/existing-registration-agencies/
  * https://www.doi.org/the-identifier/resources/
  * doi:10.1000/292
  * etc

====Registration agencies====
===crossref===

see [[https://www.crossref.org/services/content-registration/|crossref]]
  * US based
  * pricing https://www.crossref.org/fees/

===datacite===
see [[https://datacite.org/|datacite]]
  * based in Germany as e.v
  * pricing Membership Fee of 2000€ and Service Fee of 500€ per year plus 0,80€ per DOI
  * etc+

===mEDRA===
  * [[https://www.medra.org/|mEDRA]] (multilingual European Registration Agency)
  * a brand of ediSer, the service company of the Italian Publishers Association
  * pricing ([[https://www.medra.org/en/terms.htm][details]])
      * 150€ startup fee, 180–6000€ per year for 30–8000 DOIs (then 4.50 to 0.45 each)
      * additional 250€ for crossref integration
  * guide https://www.medra.org/en/guide.htm

====metadata schema====
  * [[https://www.medra.org/schema/onix/DOIMetadata/2.0/ONIX_DOIMetadata_2.0.xsd|ONIX for DOI Metadata Schema v2.0]]

====generating DOIs====
  * https://datacite.org/blog/cool-dois/