PNDS Architecture - an overview

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Presentation transcript:

PNDS Architecture - an overview Neil Smith knowledge integration ltd © 2005 knowledge integration ltd www.k-int.com

What is it? Single interface allowing access to multiple content types: Cultural Sector (esp. Sense of Place) eGoverment Community Information Learning Resources Ready-Reference Extensible and Adaptable © 2005 knowledge integration ltd www.k-int.com

Multiple Levels of Integration Shallow eGovernment Deep SeamlessUK Sense of Place Projects © 2005 knowledge integration ltd www.k-int.com

How does it work? 3 major components: Search / Discovery Subsystem Repository Subsystem Web Application © 2005 knowledge integration ltd www.k-int.com

High Level Architecture (user perspective) © 2005 knowledge integration ltd www.k-int.com

Search Protocols © 2005 knowledge integration ltd www.k-int.com

Local Repository © 2005 knowledge integration ltd www.k-int.com

How do I make my resources available to the PNDS? 2 Main Options: Harvesting metadata into the Repository OAI-PMH ‘Live’ Cross – Searching Z39.50 SRU/W Other protocols by negotiation …. © 2005 knowledge integration ltd www.k-int.com

Searching – Pros & Cons Pro: Con: Ensures very latest results are returned Resource owner determines what is searchable No storage overhead on gateway Con: Can slow overall performance Relies on good connectivity Places unknown performance overhead on your server. © 2005 knowledge integration ltd www.k-int.com

Harvesting – Pros & Cons Better search performance for end users Efficient & resilient use of network bandwidth (after initial data load) Potential for re-indexing on gateway Con: Not live - users search a ‘snapshot’ of the resource Issues over what gets harvested – metadata, thumbnails, resources … © 2005 knowledge integration ltd www.k-int.com

Recommendation All Cultural Sector Contributors should make their resources available to PNDS via OAI-PMH unless either: A search interface has already been implemented Or The collection is extremely volatile with availability changing throughout the day © 2005 knowledge integration ltd www.k-int.com

Issues to be addressed How do I implement OAI-PMH? What gets harvested? How do I describe my resources? Metadata Schema Controlled Vocabularies How do I describe my collection? Service Registries © 2005 knowledge integration ltd www.k-int.com

What might it look like? www.k-int.com © 2005 knowledge integration ltd www.k-int.com

© 2005 knowledge integration ltd www.k-int.com

© 2005 knowledge integration ltd www.k-int.com

© 2005 knowledge integration ltd www.k-int.com