Discussion Class 2

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Discussion Class 2

• Identifiers

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Administration

• CS 502 is oversubscribed
• No more registrations will be accepted
• Second discussion section next week

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Administration

• Assignment 1
• To complete this assignment you will need
• An account on nomad1.nomad.cornell.edu
• An administrator account on the CNRI Handle
  System
• If you signed up as taking the course for credit,
  these accounts will have been set up
  automatically for you.
• CHECK EARLY. If the accounts are not available,
  send email to the Teaching Assistants.

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Seminar Tomorrow
Jon Kleinberg, Computer Science "Information
Networks Some Models and Algorithms" Phillips
101, 415 to 515
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Administration
Netscape proxy configuration See the Course
Notices about a problem with the connection and
how to fix it.
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Discussion Classes
Format Question Ask a member of the class to
answer Provide opportunity for others to
comment When answering Give your full
name Stand up Speak clearly so that all the
class can hear
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Question 1 The Library of Congress is very
interested in Uniform Resource Names. (a) Why
should URNs be important to the Library? (b)
Which characteristics of URNs are most important
to the Library?
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Question 2 Compare Handles and PURLs as systems
for managing online information. (a) What
aspects of PURLs are superior to Handles? (b)
What aspects of Handles are superior to PURLs?
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Question 3 (a) What are the differences
between Handles and Digital Object Identifiers
(DOIs)? (b) Why did D-Lib Magazine change from
using Handles to using DOIs?
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Question 4 The IETF and the W3C have have
numerous working groups and meetings about URNs
since 1994, but nothing has happened. (a) Why
has this effort not achieved more? (b) What are
the barriers to using URNs today?
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Question 5 The National Library of Medicine
gives an identifier to every journal article that
it indexes, called a "PubMed ID". The library
has a database system that allows any user to
look up a PubMed ID and find what it refers
to. (a) Is this a URN?