This document discusses strategies for aggregating educational content including key technologies like metadata standards, harvesting protocols, federated search, and publishing interfaces. It describes technologies like IEEE LOM for metadata, OAI-PMH for harvesting metadata, SQI for federated search across repositories, and SPI for publishing content. Examples are given of implementing these standards and protocols in systems like the ARIADNE harvester and registry.

1. Strategies for Aggregating Educational Content Bram Vandeputte & Joris Klerkx http://bit.ly/c6mRZC http://bit.ly/bram-vandeputte

2. Key Technologies Metadata (IEEE LTSC LOM) describe learning resources with ICOPER AP Harvesting (OAI-PMH) get learning resource metadata and copy locally Federated Search (SQI) distribute issued queries to remote repositories Publishing (SPI) add new learning resources in ‘a’ repository

3. Metadata & Educational Content IEEE LTSC LOM Example taken from: http://www.dlib.org/dlib/january08/ceri/01ceri.html

4. Harvesting with OAI-PMH

5. How OAI-PMH works OAI “VERBS” Identify ListMetadataFormats GetRecord ListIdentifiers ListRecords ListSets Service Provider Metadata Provider HTTP Request HTTP Response (OAI Verb) (Valid XML) H A R V E S T E R R E P O S I T O R Y OAI OAI

6. Example verb: ListRecords Purpose Retrieves metadata records for multiple items Parameters from – start date (O) greater than or equal to until – end date (O) less than or equal to set – set to harvest from (O) resumptionToken – flow control mechanism (X) metadataPrefix – metadata format (R)

7. Example verb: GetRecord Purpose Returns the metadata for a single item in the form of an OAI record Parameters identifier – unique id for item (R) metadataPrefix – metadata format for the record (R)

8. Example OAI-PMH Calls Identify http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb= Identify ListMetadataFormats http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=ListMetadataFormats ListRecords http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=ListRecords&metadataPrefix=oai_lom http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=ListRecords&resumptionToken= GetRecord http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=GetRecord &identifier=oai:ariadne.cs.kuleuven.be:BLKLKP1382&metadataPrefix=oai_lom ...

9. Example : http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=ListRecords&metadataPrefix=oai_lom

10. Setting up OAI-PMH Target OAI-PMH verbs

11. ARIADNE Harvester Incremental, scheduled harvesting Supports SPI specification Integrated with Registry, Validation, Identification, Transformation RSS Alerts http://bit.ly/fA8e0U

12. Validation Service Paste metadata record e.g LOM instance Select validation scheme uri e.g http://ltsc.ieee.org/xsd/LOM/strict Validate & Consult Validation Errors Based on XSD Schema & Schematron Rules http://bit.ly/90va7d In markup languages , Schematron is a rule-based validation langu age for ma king assertions about the presence or absence of patterns in XML trees. It is a structu ral schema language expressed in XML using a small number of elements and XPath .

13. Example Validation Service http://bit.ly/90va7d

14. Harvesting Infrastructure External Repository ARIADNE Harvester validation service harvester log OICS 1 2 3 4 5 6

15. Federated Search with SQI

16. Simple Query Interface CEN WS-LT specification (CWA 15454:2005) Neutral (Query Language + Result Format), e.g. PLQL for query + LOM for results Synchronous & asynchronous queries Stateful & Stateless Implementation Session Management Example SOAP endpoint: Session Management: http://ariadne.cs.kuleuven.be/ariadne-registry/services/SqiSessionManagement Target: http://ariadne.cs.kuleuven.be/ariadne-registry/services/SqiTarget Example RESTful endpoint: http://ariadne.cs.kuleuven.be/ariadne-registry/api/sqitarget?query=ariadne&start=1&size=1&lang=plql1& format=lom http://www.dlib.org/dlib/january08/ceri/01ceri.html

17. Simple Publishing Interface Pull with harvest, publish with push technology CEN/ WS-LT CWA16097 SPI Facilitate metadata & resource publishing from client tools enable interoperability between components in OER federation http://www.dlib.org/dlib/september10/ternier/09ternier.html

18. Collection Registry http://bit.ly/cGdsYd SPI SQI OAI-PMH ARIADNE Harvester OICS

19. CEN/WS LTS N 623 4.

20. Data Model IMS LODE REGISTRY MODEL BASED ON THE ISO 2146 STANDARD: “REGISTRY SERVICES FOR LIBRARIES AND RELATED ORGANIZATIONS

21. “ Alliance to make shared online learning resources available to educators and students around the world” http://www.globe-info.org / >1.000.000 68.003

22. Thanks! Questions? http://bit.ly/c6mRZC Interested?