Statistics: Uniform Resource Names (urn:nbn)
Since September 2001, the German National Library has been administered URNs
for online publications and academic publications. Since then,
1436091 URNs with more than 140.000 accesses (status: 01.01.2010) have been registered.
At present, 415 institution are registered, 420 of them are actively using this procedure.
At present, a total of 35 % of all registered original URLs have already
been corrected due to server modifications. URLs have a very high rate of
temporary failures. At times, three server failures were reported within 4
weeks, followed by failure free periods lasting for months. As a result of
this experience, the German National Library executes a link check daily to
exclude the indication of inactive URLs in the resolving process.
For the URN subname space the additional registration of hashcode for checking
document consistency is optional.
The new procedure for retrospective assignment and registration of URNs for
online publications at the German National Library meets with a
positive response. At present, about 40% of all registered URNs have been
Evaluation period: 01.09.2001 until 01.01.2010