A Trust P2P network for the Access to Open Archive resources

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A Trust P2P network for the Access to Open Archive resources.

Emanuele Bellini and Paolo Nesi

Department of Systems and InformaticsUniversity of Florence

http://www.disit.dsi.unifi.it/

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Trust P2P network for the Access to Open Archive resources

Context- The evolution of technologies improved the Open Archive (OA)

capabilities of storing more complex and structured contents, encapsulating resources and metadata as single entities (MPEG21, METS, SCORM, etc.).

- These objects in scientific and cultural heritage fields need:

a) authority, b) reliability,c) retrievability,d) manipulability,e) wide dissemination

to become collective knowledge.

University of Florence - Department of Systems and Informatics - http://www.disit.dsi.unifi.it/

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• Data Providers deal with both the deposit and publication of resources in a repository and they "expose" for collecting the metadata about resources in the repository.

• Service Providers use the OAI-PMH interfaces of the Data Providers to collect and store their metadata.

- CiteSeer (information science), - RePec (research paper in economics), - Pleiadi (OAI resources), - OAIster.

Open Archive overview



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OAIster service provider I



This proposal has tried to eliminate the so called ‘dead ends’ of the query results provided by OAI service providers.

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The users retrieve not only descriptions about resources, but they have access to real digital resources thorough the URL of the access pages of CMS

But…

OAIster service provider II

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Principal problems


a) The user may see different user interface, for each resource.

b) The user has to “jump” among different portals to get the resources not found on a first portal.

c) There are no guarantee of successful access

d) It is not possible to enrich / annotate / manipulate the content by the user

e) There are no features for exploiting the structural and semantics richness of the content (semantic query)

f) It is difficult to sustain a unique global meta-catalogue for all resources in the world.


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Research Objectives

To face all these issues the proposed solution intends to:

1) disseminates the OAI institutional repository resources in a trustable way, while preserving their authority and reliability

2) generates more Intelligent Content from OA resource for direct content manipulation/enrichment/annotation

3) implements a ‘scalable and distributed access point’ going beyond the current non-homogeneous research and access tools and interfaces.



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Our approach comes from the success of P2P networks for searching, accessing and distributing information.

The P2P approach:

a) It increase the retrievability of resources rising the number of copies available on the network (wide dissemination).

b) It provides a unique logical view of different and distributed repositories solving the repositories cross-search issue


Peer to Peer approach I


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c) It provides a direct access to the resource

d) It increases the digital preservation capability thanks to the duplication of the resources.

e) Thanks to the AXMEDIS P2P solution, the user can exploit the Intelligent Content capabilities for manipulating / enriching / annotating.


Peer to Peer approach II


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The proposed solution is based on the AXMEDIS framework (http://www.axmedis.org).

The novel AXMEDIS approach provides tools for an efficient and valuable content management: from production, elaboration, management and protection, to a real multi-channel distribution.

The AXMEDIS P2P network is an open and scalable solution for setting up P2P networks for multimedia content distribution and sharing and allows content owners and distributors to create efficient, controllable, legal and secure P2P networks.


AXMEDIS overview


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AXMEDIS P2P Elements

- AXTracker is a modified BitTorrent Tracker managing the AXMEDIS P2P network and community. The tracker is used to publish new content by posting on it BitTorrent information and obtaining IDs for nodes and files.

- AXEPTool is a specific P2P BitTorrent Client Node. It is able to accept automated requests of publishing, downloading, monitoring, etc. These facilities have been included to allow the P2P network controllability.

- AXMEDIA is a specific P2P BitTorrent Client Node for final user content sharing and B2C (Business to Consumer) content distribution.


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AXMEDIS based Architecture


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Content production steps

1) The solution collects by OAI-PMH the simple (Dublin Core) or complex (MPEG-21, METS), metadata and related physical resources from OA.

2) The system bundles the resource, its metadata together in an MPEG-21/AXMEDIS object, mapping the DC or other schema into a descriptor item in the MPEG-21

3) It requires a licence for the new Intelligent Object.

4) Finally it publishes the new OA Intelligent Object on AXEP Tool (P2P)


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Content Production flow


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Scalability of AXMEDIS infrastructure

The content production node AXMEDIS can be replicated in order to distribute the load of the content production.


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OA Intelligent Objects capabilities

This new OA content may include:- any kind of digital resources and metadata, - behaviours- presentation interactive layers (HTML, SMIL or other formats)

Examples of Functions:

• to provide information in a proactive manner, such as user generated content.

• to exchange annotations and OA complex content among end-users.

• to interact with these collections of intelligent content in order to (i) migrate them to other devices, (ii) organize them into local database, (ii) share them with other users.


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Persistent Identifiers

Authority: The OA intelligent content has a credible PI (National Bibliography Number, DOI, ISBN) included in the metadata

Reliability: The intelligent object connecting to the appropriate resolution service resolves the PI to the master copy of that digital object and with a mathematics (hash) and/or semantics comparison (metadata) it verifies its integrity.

In this approach, the Digital Library plays the role of “supervisor” on the reliability of the copy required.


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This solution redefines the Data provider roles and introduces a new actor in the OAI architecture: the AXMEDIS Content Production node (AXCP GRID).

The roles of the Data Provider consist in:

a) selecting and preserving the resources,

b) certifying the resources exchanged through P2P network, (new)

c) providing the resources to the Content Production node, for packaging in a new intelligent object for interaction and multichannel distribution.(new)


Impact on OA Architecture


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1) AXP2P solution allows the creation of efficient, controllable, legal and secure P2P networks for OA resources distribution and sharing.

2) Final users have a direct access to certified resources and they may be stimulated to create and share their collection, setting the conditions for developing a certified Personal Digital Library, in the respect of IPR


Conclusions


A Trust P2P network for the Access to Open Archive resources

Technology

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