1. System Update 2010
Chuck Koscher
Director of Technology
ckoscher@crossref.org
 Status
 Rewrite
 Quality

2. 0
1,000,000
2,000,000
3,000,000
4,000,000
5,000,000
6,000,000
7,000,000
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
Cur r ent Year Backf i l e
 Deposits

3. Metadata Queries
0
50,000,000
100,000,000
150,000,000
200,000,000
250,000,000
300,000,000
350,000,000
400,000,000
450,000,000
2002 2003 2004 2005 2006 2007 2008 2009 2010
Total
Matches
 Queries
 DOI Queries: 2009 73,414,782
2010 70,940,700
 A lot of users pulling metadata

4.  Resolutions

5.  System Rewrite
 Query system is done (1st
revision anyway)
 Improved performance (DOI queries take 10-20msec Vs 200+ msec)
 Aggregated forward link alert emails (no more email storms)
 Integrated formatted citation search
<query>
<unstructured_citation>
Clow GD, McKay CP, Simmons Jr. GM, and Wharton RA, Jr.
1988. Climatological observations and predicted sublimation
rates at Lake Hoare, Antarctica. Journal of Climate 1:715-728
</unstructured_citation>
</query>
</body>
<citation_list>
<citation key="ref1">
<unstructured_citation>
Clow GD, McKay CP, Simmons Jr. GM, and Wharton RA, Jr.
1988. Climatological observations and predicted sublimation
rates at Lake Hoare, Antarctica. Journal of Climate 1:715-728
</unstructured_citation>
</citation>
</citation_list>
Query
Reference
Deposit

6.  System Rewrite
 Deposit system
 Design specification is underway
2010 2011
Design
Build
DB migration
Shadow deployment
Full deployment
 Continue co-development with Atypon
 CrossRef deploys and operates
 CrossRef owns IP, has access to source code, can initiate/make changes

7.  System Rewrite
 Deposit system – notable changes
 Better title management
 Support date range based ownership
 Ownership by publisher, not prefix
 Allow for co-owners
 Improve deposit workflow
 Validate XML during upload.
 Separate Handle registration and CrossRef registration.
 Provide a daily activity digest.
 Generic DOI relationships (expand upon components)
NISO/NFAIS Supplemental Journal Article Materials Project
 Over-haul conflicts
 Minimize nuisance conflicts
 Change default behavior to prevent conflicts (reject) especially
across publishers. Selectively allow create & correct model

8.  Quality
 DOI persistence is strong, but could be better
 Our tests show 5-10% of tested DOIs fail to reach intended target
 Independent tests show 3% of DOIs are broken.
 Metadata is good enough for linking (20-40% matching rate)
 … but increasingly used for display
 Biggest offenses : Author initials, no article title (min length=0)
 Pubmed data viewed by some as far more reliable.
 NFAIS Best Practices for Publishing Journal Articles
http://www.nfais.org/files/file/Best_Practices_Final_Public.pdf

9. www.crossref.org/help
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10. www.crossref.org/help
support.crossref.orgNew!