1. Fedora Content Models for the National Science Digital Library Data Repository Fedora User’s Group Meeting Copenhagen, September 28, 2005 Carl Lagoze Cornell Information Science

2. NSDL Context

3. A bit of NSDL background Mission: “Improve Science, Math, Engineering education through digital libraries” Original NSDL solicitation in 1999 Over 180 projects funded Core integration (Columbia, Cornell, UCAR) charged with providing organizational, technical infrastructure CI (Cornell) funding through 2006 http://www.nsdl.org

4. STEM Resource …who used it …how was it used …how is it described & rated …how is it classified …how does it related to standards …how has it been aggregated …what has it been used with Information in Context

5. Information Network Overlay

6. NSDL Data Repository (NDR) Fedora-based implementation of information network overlay Content model to represent NSDL information entities and relationships Extensive use of resource index and new oai service

7. Fedora NDR Objects: agents, metadata items, resources, services (metadata providers), aggregations Relationships: metadataFor, providedBy, memberOf, representedBy + ontology-specific Disseminations: metadata transformations OAI harvesting: both static and generated metadata formats Authentication/Authorization: Collections and services manage their own repository content, contribution of annotations, new content

9. Live Demo http://fedora.nsdlib.org:8380/repository/big Bang.htm http://fedora.nsdlib.org:8380/repository/big Bang.htm

10. Metadata in the NDR Multiple formats static (ingested from provider) static (ingested from provider) generated/crosswalked generated/crosswalkedMulti-sourced de-dupped de-dupped Retain branding of metadata Retain branding of metadata OAI-PMH harvesting

11. Resources, Metadata, Metadata Providers

12. Metadata Content Model

13. proai – Fedora 2.1 OAI Service proai – Fedora 2.1 OAI Service Old OAI service – harvest only system DC Support for arbitrary metadata formats static data streams and disseminator generated static data streams and disseminator generated exploits queries to resource index exploits queries to resource index proai.properties configuration

14. proai configuration

15. Collections and Aggregations Set basis Semantic basis Agent associated

16. Aggregation Model

17. Annotation/Reviews Unstructured metadata about a resource Exists as resource and annotation Separate agent provenance from annotated resource

18. Annotation Model

19. The SDSC Archive Uses Storage Resource Broker (SRB) Monthly snapshots of crawlable content Identifies resource as collection of related web pages Can’t access protected content, robots.txt blocked, etc. – no requirement for NSDL projects to participate REST interface for read access (but not submission – yet)

20. Integrating SDSC Archive into NDR