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