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Beyond OpenURL:
making the most
of Crossref
metadata
Patricia Feeney

Product Support

@CrossrefSupport
About Crossref
• 8,000+ publisher members

• almost 90 million scholarly content items (now
including preprints)

• Persistent citation linking (through DOIs)

• Funder identifiers

• Report and display corrections & retractions

• Open REST API & Search

• Data about content activity e.g. social, dataset links
Who uses Crossref metadata?
• Publishing vendors

• Peer review systems

• Reference manager systems

• Lab & diagnostics suppliers

• Info management systems

• Educational tools

• Data analytics systems

• Literature discovery services

• Registration Agencies
• Funders

• Institutions

• Archives & repositories

• Research councils 

• Data centres

• Professional networks 

• Patent offices

• Indexing services
OpenURL
• Match metadata to DOIs

• Match DOIs to metadata

• Free library account
https://doi.crossref.org/openurl?
issn=03770273&aulast=Walker&volume=54&spage=117&date=1983&redirect=fal
se&pid=username:password
Citation metadata
including…
author names, ORCIDs, affiliations, article titles,
ISSN, ISBN, pages, issue #, volume #s, dates,
identifiers
more metadata
reference lists, funding data, ORCIDs,
license data, clinical trial numbers, errata,
retractions, updates and more through our
Crossmark service, JATS-formatted
abstracts, relationships between items…
Building new connections
• Identifiers

• Crossmark

• Funding data

• Relationships
Crossmark
Crossmark allows members to record
publication status (updates, retractions,
errata) funding information, TDM licenses,
author ORCIDs. peer review status, link to
clinical trials, and more
http://api.crossref.org/works?
filter=has-clinical-trial-number:true
• maintain a registry of clinical trials
(and assign DOIs to them
• Publishers include the clinical
trials in their metadata (via
Crossmark)
• We link the trials to related
articles
How do I find DOIs for my
citations?
Metadata Search (http://search.crossref.org)
• Search by title fragment, author name
• Find works related to an ORCID
• Search by ISSN
• Search by grant / award number
• Include / exclude terms (using + and !)
Simple Text Query (https://doi.crossref.org/simpleTextQuery)
Cut-and-paste formatted references, will return DOI
matches (when available)
Free but requires registration
Simple Text Query form
REST API
• Search, filter, facet, and sample Crossref metadata

• No login, no fee

• Do whatever you want with the metadata:

• Search

• Report on funding, publishing, author activities

• Ingest scholarly metadata

• Locate full text for content mining
How researchers use the REST API
Use metadata to:

• Connect research output to funding

• Connect research output to Clinical trials

• Import records into ORCID

• Identify text and data mining license info and full
text URLs
How many members? 8,415

http://api.crossref.org/members?rows=0

How many records does Crossref have? 89,377,410

http://api.crossref.org/works?rows=0

How many journal article records? 66,739,806

http://api.crossref.org/types/journal-article/works?rows=0

Book chapters? 10,425,160

http://api.crossref.org/types/book-chapter/works?rows=0

REST API
How many works have license information? 25,799,562

http://api.crossref.org/works?filter=has-license:true&rows=0

How many license types are there? 352

http://api.crossref.org/licenses?rows=0

How many works have a CC-BY license? 254,986

http://api.crossref.org/works?rows=0&filter=license.url:http://creativecommons.org/
licenses/by/3.0/

How many works have full text links? 25,527,916

http://api.crossref.org/works?filter=has-full-text:true&rows=0

Get license info for a single journal

http://api.crossref.org/works?facet=license:*&filter=issn:2090-8091
Records containing the term “blood” 480,587

http://api.crossref.org/works?query=%22blood%22&rows=0

How many records with the word "blood" in the metadata have license
information and full text links? 170,388

http://api.crossref.org/works?filter=has-license:true,has-full-
text:true&query=blood&rows=0

Get all of those records

http://api.crossref.org/works?filter=has-license:true,has-full-text:true&query=blood

Get matching records for a given publisher

look up member ID: http://api.crossref.org/members?query=hindawi

look up using ID: http://api.crossref.org/members/98/works?filter=has-license:true,has-
full-text:true&query=blood&rows=50
Format Content Type CrossRef DataCite mEDRA
RDF XML application/rdf+xml Yes Yes Yes
RDF Turtle text/turtle Yes Yes Yes
Citeproc JSON application/vnd.citationstyles.csl+json Yes Yes Yes
Schema.org in JSON-LD application/vnd.schemaorg.ld+json No Yes No
Formatted text citation text/x-bibliography Yes Yes Yes
RIS application/x-research-info-systems Yes Yes No
BibTeX application/x-bibtex Yes Yes Yes
CrossRef Unixref XML application/vnd.crossref.unixref+xml Yes No No
DataCite XML application/vnd.datacite.datacite+xml No Yes No
ONIX for DOI application/vnd.medra.onixdoi+xml No No Yes
Content negotiation (http://citation.crosscite.org/cn)
Retrieve metadata
records from
Crossref, DataCite,
and mEDRA
Resources
• Full REST API tour: https://github.com/CrossRef/rest-api-doc/blob/
master/rest_api_tour.md

• REST API docs: http://api.crossref.org

• TDM docs: https://support.crossref.org/hc/en-us/sections/203047543

• Crossref Support: http://support.crossref.org , @CrossrefSupport
Thank you!
Questions?

support@crossref.org

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Beyond openurl

  • 1. Beyond OpenURL: making the most of Crossref metadata Patricia Feeney Product Support @CrossrefSupport
  • 2. About Crossref • 8,000+ publisher members • almost 90 million scholarly content items (now including preprints) • Persistent citation linking (through DOIs) • Funder identifiers • Report and display corrections & retractions • Open REST API & Search • Data about content activity e.g. social, dataset links
  • 3. Who uses Crossref metadata? • Publishing vendors • Peer review systems • Reference manager systems • Lab & diagnostics suppliers • Info management systems • Educational tools • Data analytics systems • Literature discovery services • Registration Agencies • Funders • Institutions • Archives & repositories • Research councils • Data centres • Professional networks • Patent offices • Indexing services
  • 4. OpenURL • Match metadata to DOIs • Match DOIs to metadata • Free library account https://doi.crossref.org/openurl? issn=03770273&aulast=Walker&volume=54&spage=117&date=1983&redirect=fal se&pid=username:password
  • 5. Citation metadata including… author names, ORCIDs, affiliations, article titles, ISSN, ISBN, pages, issue #, volume #s, dates, identifiers
  • 6. more metadata reference lists, funding data, ORCIDs, license data, clinical trial numbers, errata, retractions, updates and more through our Crossmark service, JATS-formatted abstracts, relationships between items…
  • 7. Building new connections • Identifiers • Crossmark • Funding data • Relationships
  • 8. Crossmark Crossmark allows members to record publication status (updates, retractions, errata) funding information, TDM licenses, author ORCIDs. peer review status, link to clinical trials, and more
  • 9.
  • 10. http://api.crossref.org/works? filter=has-clinical-trial-number:true • maintain a registry of clinical trials (and assign DOIs to them • Publishers include the clinical trials in their metadata (via Crossmark) • We link the trials to related articles
  • 11. How do I find DOIs for my citations?
  • 12. Metadata Search (http://search.crossref.org) • Search by title fragment, author name • Find works related to an ORCID • Search by ISSN • Search by grant / award number • Include / exclude terms (using + and !)
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19. Simple Text Query (https://doi.crossref.org/simpleTextQuery) Cut-and-paste formatted references, will return DOI matches (when available) Free but requires registration
  • 21.
  • 22. REST API • Search, filter, facet, and sample Crossref metadata • No login, no fee • Do whatever you want with the metadata: • Search • Report on funding, publishing, author activities • Ingest scholarly metadata • Locate full text for content mining
  • 23. How researchers use the REST API Use metadata to: • Connect research output to funding • Connect research output to Clinical trials • Import records into ORCID • Identify text and data mining license info and full text URLs
  • 24. How many members? 8,415 http://api.crossref.org/members?rows=0 How many records does Crossref have? 89,377,410 http://api.crossref.org/works?rows=0 How many journal article records? 66,739,806 http://api.crossref.org/types/journal-article/works?rows=0 Book chapters? 10,425,160 http://api.crossref.org/types/book-chapter/works?rows=0 REST API
  • 25. How many works have license information? 25,799,562 http://api.crossref.org/works?filter=has-license:true&rows=0 How many license types are there? 352 http://api.crossref.org/licenses?rows=0 How many works have a CC-BY license? 254,986 http://api.crossref.org/works?rows=0&filter=license.url:http://creativecommons.org/ licenses/by/3.0/ How many works have full text links? 25,527,916 http://api.crossref.org/works?filter=has-full-text:true&rows=0 Get license info for a single journal http://api.crossref.org/works?facet=license:*&filter=issn:2090-8091
  • 26. Records containing the term “blood” 480,587 http://api.crossref.org/works?query=%22blood%22&rows=0 How many records with the word "blood" in the metadata have license information and full text links? 170,388 http://api.crossref.org/works?filter=has-license:true,has-full- text:true&query=blood&rows=0 Get all of those records http://api.crossref.org/works?filter=has-license:true,has-full-text:true&query=blood Get matching records for a given publisher look up member ID: http://api.crossref.org/members?query=hindawi look up using ID: http://api.crossref.org/members/98/works?filter=has-license:true,has- full-text:true&query=blood&rows=50
  • 27. Format Content Type CrossRef DataCite mEDRA RDF XML application/rdf+xml Yes Yes Yes RDF Turtle text/turtle Yes Yes Yes Citeproc JSON application/vnd.citationstyles.csl+json Yes Yes Yes Schema.org in JSON-LD application/vnd.schemaorg.ld+json No Yes No Formatted text citation text/x-bibliography Yes Yes Yes RIS application/x-research-info-systems Yes Yes No BibTeX application/x-bibtex Yes Yes Yes CrossRef Unixref XML application/vnd.crossref.unixref+xml Yes No No DataCite XML application/vnd.datacite.datacite+xml No Yes No ONIX for DOI application/vnd.medra.onixdoi+xml No No Yes Content negotiation (http://citation.crosscite.org/cn) Retrieve metadata records from Crossref, DataCite, and mEDRA
  • 28. Resources • Full REST API tour: https://github.com/CrossRef/rest-api-doc/blob/ master/rest_api_tour.md • REST API docs: http://api.crossref.org • TDM docs: https://support.crossref.org/hc/en-us/sections/203047543 • Crossref Support: http://support.crossref.org , @CrossrefSupport