Transcript Diapositiva 1 - Institute for the Study of Labor

The PersID project
Meta (Global) Resolver Service Infrastructure
www.persid.org
Maurizio Lunghi
Fondazione Rinascimento Digitale
Bonn 1 Feb 2011
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Rationale
• There will not be a worldwide dominant PI system, so the challenge
is the interoperability among the major PI systems
• Technology is not the most important challenge – but agreed
policies and governance (preferably under control of the international
research, scholarly and cultural heritage communities)
• It is necessary to provide (future) services to stakeholders in the
(changing) research and scholarly processes and information
exchanges
…. Knowledge Exchange Consortium & Surf Agency
promoted a joint
initiative ….
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Objectives
• To set up a European infrastructure to resolve the URNs
particularly in the NBN namespace
• To establish a policy for long term sustainability of an
international resolution and discovery service
• To define an interoperability framework among URN
namespaces and different PI systems
• To review & update the related URN RFCs
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Why NBN?
Trust-based – National Libraries are responsible for the
management of the namespaces
In use – several relevant initiatives are implementing NBN
Open & Flexible
– suitable for different user communities (cultural,
scientific, private ..)
– caters
for various needs and requirements (e.g.
selection criteria, rights management, etc ..)
– enables
different architectures to share responsibility
sustainability
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and
Outcoming results - I
 Around 7 countries (and other are coming) have decided to set up
a unique point of presence for their NBN national registers.
 User Requirements and cooperation with Europeana Connect in
order to avoid overlapping and competition. Many other initiatives
have been contacted for cooperation.
 First prototype of the Meta Resolver offering a unique entry point
for all the 7 countries NBN national registers.
 Sustainability policy and costs models analysis and proposal are
expected soon.
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Outcoming results - II
NBN:DE:IZA:12345
NBN:IT:FRD:12345
PersI
D
NBN answer for any country
NBN DE
NBN NL
NBN IT
NBN FIN
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PersID & IETF
Revision of RFCs
The IETF in a meeting in Maastricht on 26 July 2010 decided to set
up a workgroup to revise 3 RFT about URN, on the base of the activity
developed by the PersID, with three tasks:
• Revision of RFC 2141 (URN Syntax) and RFC 2483 (URN service)
• Revision of RFC 3188 (Using National Bibliography Numbers as
Uniform Resource Names)
• Evaluation of all the other URN-related RFCs, in order to decide if
there is a need to revise them
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Participants
 Danmarks Elektroniske Fag og Forskningsbibliotek - Denmark's Electronic
Research Library (DEFF)
 Consiglio Nazionale delle Ricerche - National Research Council (CNR), Italy
 Data Archiving and Networked Services (DANS), Netherlands
 Deutsche Nationalbibliothek - German National Library
 Det Kongelige Bibliotek - The Royal Library, Denmark
 Kungliga biblioteket - National Library of Sweden
 Fondazione Rinascimento Digitale (FDR), Italy
 Kansalliskirjasto - National Library of Finland
 SURFfoundation, Netherlands
 Knowledge Exchange
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APARSEN
Network of Excellence – 4 years
WP2200
Identifiers and Citability
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Weak points: a lot of initiatives are on-going but fragmented
 A unique PI technology or domain cannot be expected/imposed
to all the user communities so we must manage heterogeneity
 Added value services tailored on different user communities, like
resolvers, are still inadequate and there are not cross-sectoral
services
Goals
 To provide an overview of the current PI systems/applications
by different user communities and criteria for evaluation model
to benchmark
 To design a reference model to describe an interoperability
framework and provide an integrated entry point
 To define community-driven added value services cross-userdomains and applicable to different PI technologies
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Thanks for your attention
Maurizio Lunghi
[email protected]
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Persistence is a contract with the user
community
Persistence is a matter of Trustworthiness
Maurizio Lunghi, Emanuele Bellini, Chiara Cirinnà
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Persistence is a matter of trustworthiness
The cloud of Persistent identifiers
ebu
ISIL
CLEI
epc
NZL
ISSN
Mace
UUID
OID
XMLORG
iso
tva
PIN
geant
UCI
IETF
service
fdc
NEWSML
publicid
fipa
WEB3D
swift
DOI
Oma
XMPP
MPEG
ogc
IPTC
OASIS
liberty
LSID
cgi
ISAN
S1000D
Smpte
dvb
Handle
NBN
nfc
ISBN
IVIS
ARK
PURL
3gpp
epcglobal
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Persistence is a matter of trustworthiness
Trusted Persistent identifiers
Trusted: No identifier is trustable and stable ‘per-se’ all characteristics
included trust ability depend by the authority and the trustworthiness of
the organisations and the community implementing that specific service.
Persistent: The only guarantee of the usefulness and persistence of
identifier systems is the commitment shown by the organisations who
assign, manage and resolve the identifiers.
Identifiers: The Identifier concept is strictly related to the association
between an alphanumeric string and the object identified. Before
assigning an identifier we must select the digital content for long term
use. An identifier for a digital content is like an identity card for a person.
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Persistence is a matter of trustworthiness
Persistent identifiers consideration
- There are a lot of identifiers (some don’t have a resolution service
associated yet) and there is no general agreement on what PI have to be
adopt in a community (e.g. Humanities community)
- Sometimes the implementation of identification services follow mainly a
technical approach neglecting for instance political and administrative point
of view.
“The persistence is a matter of service (Kunze)”.. yes.. but it is crucial define
some parameters and/or guidelines in order to design and evaluate the
appropriateness of this service…
- The mission of a PI system it is not the mere identification (from this point
of view a cool-URI could be sufficient) but the certification of the resource,
their authority, their belonging to a specific community (library, audiovisual,
etc), the standardization, etc.
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Persistence is a matter of trustworthiness
General Evaluation Criteria of Trusted Persistent Identifers
1. Scope
2. Global & Standard
3. Resolvable
4. Reliable
5. Sustainable
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Persistence is a matter of trustworthiness
General Evaluation Criteria of Trusted Persistent Identifers
1) Scope
1.1 What types of resources
The community must first of all identify clearly what an identifier can refer
to, real, digital, abstract objects, what material they want to organise and
structural relations, they must also define the use they need to implement
also in future.
1.2 Flexibility
An identifier system is more effective if it is able to accommodate the
special requirements of different types of material or collection within a
user community. The granularity, that refers to the level of detail at which
persistent identifiers has to be assigned, must be taken into account.
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Persistence is a matter of trustworthiness
General Evaluation Criteria of Trusted Persistent Identifers
2) Global & Standard
We consider the identifier as a unique label that is associated with a
single object in a certain context. This context have to be well defined
and regulated by reliable institutions recognised by the user community.
Moreover the resolution to multi targets should be only related to
different location of the same object instead of for instance to different
versions. A local identifier is clearly not suitable.
The adoption of a open standard allows the interoperability, wide
adoption, well authority, resource production control, etc.
3) Resolvable
PI systems must be at least ‘resolvable’ in terms of the possibility to have
info-data about a named resource through the domain-resolver. Some PI
systems are ‘actionable’ that means they use a resolution protocol like
the URL for the effective access to the resource. In any case some
additional added value services about the resource would be welcome.
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Persistence is a matter of trustworthiness
General Evaluation Criteria of Trusted Persistent Identifers
4) Reliability (the actual contract with the users community)
4.1 Authority
The authority of a PI is derived by the authority and credibility of the Naming
Assign Authority (NAA) and the Naming Mapping Authority (NMA).
Moreover, the ‘authority’ has to be recognised to an institution by the user
community.
4.2 Policy
The NAA in cooperation with the related user community has to define
responsibilities and criteria for accreditation of content provider (es.
University digital library). Some of these criteria are referred to the type of
policies adopted by content providers for their own repositories. They are
important to define the pertinence of that policies in the perspective of to
adopt a PI solution It is necessary to establish specific agreements between
the NAA and content provider in relation to: content selection, digital
preservation global policies, etc.
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Persistence is a matter of trustworthiness
General Evaluation Criteria of Trusted Persistent Identifiers
4.3 Robustness of service infrastructure
This issue should be faced in relation to a specific community requirements
and defined by a Service Level Agreement. Each community has to define
its own SLA for naming infrastructure.
For instance the resolution service must be always granted via some
redundancy strategies that can be different for each community. The
register with names association must to be updated but a community can
define the frequency of updating; the delay of resolution response should
be defined by the user community requirements as well.
5) Sustainable
As we said before, ‘sustainability’ depends on the user community will
(interest) of using that material now and in future: a PI system is only a
minor part of a trusted digital repository for example. The naming service
must have a long term sustainable policy and business model in order to
assure the ‘persistence’ service promised to users. Its concerns evaluation
of costs, technology solutions, standard adoptions, political decisions, etc.
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