Latest blog posts
Martyn Rittman
2021 November 10

Event Data now with added references

Event Data is our service to capture online mentions of Crossref records. We monitor data archives, Wikipedia, social media, blogs, news, and other sources. Our main focus has been on gathering data from external sources, however we know that there is a great deal of Crossref metadata that can be made available as events. Earlier this year we started adding relationship metadata, and over the last few months we have been working on bringing in citations between records.

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Rachael Lammey
2021 November 03

Come and get your grant metadata!

Tl;dr: Metadata for the (currently 26,000) grants that have been registered by our funder members is now available via the REST API. This is quite a milestone in our program to include funding in Crossref infrastructure and a step forward in our mission to connect all.the.things. This post gives you all the queries you might need to satisfy your curiosity and start to see what’s possible with deeper analysis. So have the look and see what useful things you can discover.

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Geoffrey Bilder
2021 October 27

Update on the outage of October 6, 2021

Update on the outage of October 6th. In my blog post on October 6th, I promised an update on what caused the outage and what we are doing to avoid it happening again. This is that update. Crossref hosts its services in a hybrid environment. Our original services are all hosted in a data center in Massachusetts, but we host new services with a cloud provider. We also have a few R&D systems hosted with Hetzner.

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Lindsay Russell
2021 October 21

More new faces at Crossref

Looking at the road ahead, we’ve set some ambitious goals for ourselves and continue to see new members join from around the world, now numbering 16,000. To help achieve all that we plan in the years to come, we’ve grown our teams quite a bit over the last couple of years, and we are happy to welcome Carlos, Evans, Fabienne, Mike, Panos, and Patrick.

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Documentation

XSD schema quick reference

We support additional schema (not listed here) for legacy purposes.

Deposit schema

Used for registering and updating DOI metadata records:

Schema Purpose Status Further info
crossref5.3.1.xsd full metadata deposits recommended documentation
crossref4.8.1.xsd full metadata deposits recommended documentation
crossref4.4.2.xsd full metadata deposits available documentation
AccessIndicators.xsd license data imported
relations.xsd relationships between DOIs and other identifiers imported
clinicaltrials.xsd relationships between publications that report on a clinical trial imported
doi_resources4.4.2.xsd used to append or update specific sets of metadata to an existing record recommended documentation

Query schema

Used for formatting XML queries:

Schema Purpose Further info
Crossref_query_input2.0.xsd used to input XML queries to the system documentation

Metadata retrieval schema

Used for retrieving our metadata:

Schema Purpose Further info
crossref_query_output2.0.xsd returns query results in xsd_xml format, used for Cited-by results documentation
crossref_query_output3.0.xsd returns query results in UNIXSD format documentation
unixref1.1.xsd returns query results in the UNIXML format, also used to support the data delivered by our OAI-PMH service documentation
unixref1.0.xsd returns query results in the UNIXML format for some older content, also used to support the data delivered by our OAI-PMH service documentation
crossref_output3.0.1.xsd used to support data files generated for bulk data distribution documentation
OAI-PMH.cr.xsd accommodates differences between Crossref’s OAI-PMH implementation and the published Open Archives OAI 2.0 schema documentation

Page owner: Patricia Feeney   |   Last updated 2021-October-05