The document summarizes system updates and plans at Crossref for 2013 and 2014. In 2013, Crossref experienced growth in data, usage, and complexity which led to work fixing performance, effectiveness, and throughput issues. Improvements included new services like FundRef and changes to allow additional data types in deposits. Looking ahead, Crossref plans to improve query logic, scale infrastructure, redesign conflict processing, and consider alternatives to OAI-PMH for data distribution.

1. System Update
AMM Workshop 2013
Chuck Koscher
Director of Technology
ckoscher@crossref.org

3. Overview
 2013 :
many growing pains
 Growth
in data
 Growth in usage
 Growth in complexity
 2013:
a lot of time spent fixing problems
 Query
performance, working hard to maintain acceptable levels
 Query
effectiveness, keeping matching rates up
 Deposit
throughput, dealing with spikes in re-deposits
 Deposit
processing with <citations>, can cause a lot of message traffic

4. Overview
 2013 :
improvements and some new services
 FundRef
 Schema

changes
 Allow MathML in article titles
 Allow JATS abstracts in deposits
 Support non-CrossRef DOIs as components
 Support text-data-mining (TDM)
Stand alone deposits (easier than sending in all metadata again)
 FundRef
 CrossMark
 Can
query on ORCIDs

5. Overview
 new
service: which RA tool
doi.crossref.org/ra/10.5284/1000389
[ { "DOI": "10.5284/1000389", "RA": "Data Cite" }]

6. Roll over from 2013 into 2014
 Tweak
the query logic to improve precision
•Return a DOI even if there are conflicts: Publishers often (mistakenly) deposit
a second DOI for something they’ve already assigned a DOI to (normally creates
a conflict). When a query finds two or more DOIs from the same publisher for a
given item, we could return one (the most recent).
 Reliability
and scaling
Deposit System
Deposit System
Query System
Query System
Data Management
Oracle
MySQL
Berkely
Lucene
Oracle
Data Management
Current
MySQL
Other
Goal
Berkely
Lucene

7. Some 2013 fun facts
 504 internal
tickets created, 154 are still open
 459 tickets closed so far in 2013 (some created in late 2012)
 ~ 400,000 lines of code
 768,115,361 metadata queries so far in 2013
 348,386,170 matched
 207,109,812 forward link queries
 3,578,469 new CY DOIs
 2,320,151 new BY DOIs
 17,735,351 updated DOIs
 1,084,529,650 RAW DOI ‘clicks’ (Dec12 thru Oct13)

8. FundRef

9. FundRef
doi.crossref.org/fundrefSearch

10. FundRef

11. 2014
 Re-design
conflict processing.
 Current
process requires too much labor following up and fixing
 Conflicts should only be created inter-member
 A given publisher will be allowed to create multiple DOIs, the system will
clean up
 Title locks should prevent nearly all journal-to-journal conflicts
 Auto cleanup the existing backlog

Consider alternatives to OAI-PMH for bulk data distribution

Accept full JATS file and/or PDF for deposits.

12. Questions