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2008 Handle System Workshop Introduction Handle Update 17 June 2008 Larry Lannom Corporation for National Research Initiatives

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Presentation on theme: "2008 Handle System Workshop Introduction Handle Update 17 June 2008 Larry Lannom Corporation for National Research Initiatives"— Presentation transcript:

1 2008 Handle System Workshop Introduction Handle Update 17 June 2008 Larry Lannom Corporation for National Research Initiatives Approved for Public Release © 2008 CNRI.

2 Corporation for National Research Initiatives 1.30Introduction and Logistics, Larry Lannom, CNRI 1.45Handle System Update, Larry Lannom, CNRI 2.15A Distributed Metadata Architecture, Tony Hammond, Nature 2.45DOI Impact on End Users, Ed Pentz, CrossRef 3.15Break 3.45Towards an Australian Persistent Identifier System: Thoughts on Services and Policy, Nigel Ward, Australian ADL Partnership Lab 4.15Handle System in European Research Infrastructure Projects, Dan Broeder, Max Planck Institute for Psycholinguistics 4.45Grid Identifier Service, Larry Lannom, CNRI 5.15Wrap Up Agenda

3 Handle System Workshop Introduction Laurence Lannom 17 June 2008 Corporation for National Research Initiatives Reston, VA

4 Corporation for National Research Initiatives Provides basic identifier resolution system for Internet –Go from object name to current state data –Name can persist over changes in location and other attributes Logically centralized, but physically distributed and highly scalable Enables association of one or more typed values, e.g., IP address, public key, URL, with each id Optimized for speed and reliability Secure resolution with its own PKI as an option Open, well-defined protocol and data model Provides infrastructure for application domains, e.g., digital libraries & publishing, network mgmt, id mgmt... Handle System

5 Role of Resolution System in Information Management on Networks Resource Discovery Search Engines, Metadata Databases, Catalogues, Guides, etc. Resolution System Repositories / Collections Corporation for National Research Initiatives Client

6 Corporation for National Research Initiatives Handles Resolve to Typed Data HS_ADMIN100acme.admin/jsmith HANDLE DATA HANDLE DATA HANDLE DATA TYPE DATA TYPE INDEX /456 URL 1 1

7 Handle Resolution is a collection of handle services, each of which consists of one or more replicated sites, Site 1Site 2 Site 1 Site 2 Site 3 …... Site n The Handle System LHS GHR each of which may have one or more servers /abcURL 4 URL #1#2#n#4#3 #1#2...

8 Handle Clients Handle System Web Browser Web Browser HTTP Get Proxy/ Web Server Proxy/ Web Server Handle Resolution Handle Resolution

9 Handle Clients Handle System Web Browser Web Browser HTTP Redirect Proxy/ Web Server Proxy/ Web Server Handle Data Handle Data

10 Handle Clients Handle System Handle Resolution Handle Resolution Handle Data Web Browser Web Browser Handle Client Plug-in Handle Client Plug-in hdl: /abc

11 Handle Clients Handle System Web Server Admin Forms HDL Admin Client HDL Admin Client Web Browser Web Browser

12 Handle Clients Handle System Web Server Admin Forms HDL Admin Client HDL Admin Client Web Browser Web Browser HTTP Handle Admin Handle Admin

13 Handle Clients Handle System HDL Admin Client HDL Admin Client Custom Client Custom Client Web Browser Web Browser

14 Handle Clients Handle System Web Browser Web Browser Handle Administration embedded in another process

15 Handle Clients Handle System Handle Administration embedded in another process Handle Resolution embedded in another process

16 Handle System Usage Library of Congress DTIC (Defense Technical Information Center) IDF (International DOI Foundation) –CrossRef (scholarly journal consortium, representing >2K publishers & societies) –CAL (Copyright Agency Ltd - Australia) –MEDRA (Multilingual European DOI Registration Agency) –Nielsen BookData (bibliographic data - ISBN) –R.R. Bowker (bibliographic data - ISBN) –Office of Publications of the European Community (OPOCE) –German National Library of Science and Technology (TIB) –Wanfang Data OECD NASA National Agricultural Library/USDA DSpace (MIT + HP) ADL (DoD Advanced Distributed Learning initiative) Los Alamos National Laboratory Research Library Australian Dept. of Ed., Sci, and Training (DEST) - PILIN project Clarin (Common Language Resources and Technology Infrastructure)

17 Corporation for National Research Initiatives Assigned Prefixes –DOI - 2,625 –Other - 1,172 Handles –DOI - 35 M –Other - Additional millions (total per prefix known only to prefix manager; LANL adding 600M but privately) Handle Services –Global Core: three service sites (added locations being worked) –Locals >1000 registered LHSs Traffic –Global: tens of millions per month –CNRI-run proxy servers: tens of millions per month Handle System Usage May 08

18 Corporation for National Research Initiatives Specification –RFC 3650: Overview –RFC 3651: Namespace and Service Definition –RFC 3652: Protocol DoDI 1322 ISO standards track for DOI HSAC - Handle System Advisory Committee –Approx 15 members representing big users –Goal: evolve to oversee the system Handle System Management and Standards

19 Corporation for National Research Initiatives License –HS Version 6.2 released June 2006 under public license –Commercial use welcomed no longer restricted to research and/or education –No licensing fees for software or underlying technology Service Agreement –Service Agreement is required if you use the software/underlying technology to resolve identifiers –One time $50 registration fee per prefix –Annual $50 maintenance fee per prefix –Fees needed to help support global root and administration Handle System Public Licensing

20 Corporation for National Research Initiatives Structured alternatives, e.g., multiple locations, in a single handle value Include selection criteria in that same value Handle client application, e.g., proxy server, performs evaluation Type = 10320/loc; value = Deployed in CNRI-run proxies and will be part of generic proxy download Approach extensible for future selection methods, e.g., chooseby language New and Upcoming Technical Developments Chooseby

21 Corporation for National Research Initiatives Successfully resolve handles that havent been registered in a handle server Not really new and not a result of any specification changes –Highly useful, but in limited circumstances –Recently implemented for a CNRI project. Quite similar to DSpace approach Directly results from the modularity of the current implementation –Backend handle server storage is pluggable –A new storage module allows handles to be computed –Will be made available in future releases New and Upcoming Technical Developments Computed Handles

22 Corporation for National Research Initiatives Simple example (and our use case) –All handles starting with 123/456: reference a specific digital object repository –That repository contains 10M objects, all identified as 123/456:1, 123/456:2, etc. –The resolution of each of those 10M handles should return the same values –New storage module, configured to use : as a delimiter, will first resolve the full handle and, if not found, will return the results for the stub handle. –If any of the set of 10M needs unique values, that handle is separately registered New and Upcoming Technical Developments Computed Handles

23 Corporation for National Research Initiatives Other computations could be performed on the string following the delimiter or on the entire handle Handles can remain static in reference form, while millions of resolution values can be changed at a single stroke New and Upcoming Technical Developments Computed Handles

24 Corporation for National Research Initiatives More Global Mirrors –Currently one primary and 2 secondaries, all run by CNRI (2 physical locations and 3 network providers) –One new (silent) secondary run by CrossRef –Policies in place - separate no money deal with service guarantees on both sides –Monitoring procedures in place –Anticipate one to two additional by end of 2008 Updated RFCs –5 years old –Some of the specification never implemented in reference implementation Execute permissions - needed on Handle values? Delegation doesnt look quite like we thought it would five years ago New and Upcoming Technical Developments Other

25 Corporation for National Research Initiatives URI registration –Goal for 2008 –Cannot speak to likelihood of acceptance –Info URI in place: info:hdl Type Registry and Delegation in the final talk New and Upcoming Technical Developments Other


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