Resource and Metadata Managementwith a Linked Data perspective
Meetup: Linked Data in SwedenApril 17, 2012
Hannes [email protected]@metasolutions.se
Multiple projects with similar goals
• Organic.Edunet as example because of its characteristics- Heterogeneous metadata- Multiple stakeholders and standards- Ontology- Big user base- Used in production environments- Not typically academic (content-centric)
EntryStore – conceptual overview
• Named graphs• REST API• ACL• Harvesting• Querying• On-the-fly MD conversions• SPARQL• Literal indexing
Open Source
Interoperability
FAO
Bio@gro
Intute
OrganicEPrints
EntryStore
LOM/XML
CustomXML
YouTubeDC/RDF
DC/RDF
Custom
OAI-PMHSQI
HTTP SPARQL
RDF coreSolr
Lessons learned - ontology
• Ontology- Good for domain experts- Pain for “annotators”- Nobody used ontology tree
• Flat list with type-ahead is popular• Difficult to grasp hierarchy
Lessons learned - licensing
• Ensure licensing is clear- Creative Commons- Open Data Commons- Custom licenses- Organic.Edunet: CC0
• Data != Metadata- Often confused when it comes to licensing
Lessons learned - interoperability
• W3C standards everywhere- Exception: some formats, e.g. IEEE LOM
• Triplification has to be done by experts
• Remix of various vocabularies
• Search engines find resources directly
Lessons learned – practical problems
• Complexity- Try to find a student...- Big technology stack
• Need for authoritative and quality-controlled (meta)data
• Legacy data has to be converted and mapped
• Scalability
WIN!
No user ever noticed the technology behind
“Rule number 1 in building web software: never show the URI. If the URI does not have a label, go and beat
somebody up.”
Tim Berners-Lee at LDOWApril 16, 2012
FAIL?
OK, there was the ontology...
“The one big ontology approach didn't work”
Tim Berners-Lee at LDOWApril 16, 2012
Current work / experiments
• Data-driven Sustainability- footprinted.org, in collaboration with Sourcemap.com- Data bridges (EIT ICT Labs)- Miljöbarometern (visualizations, Google Refine)- Green Hackathon
• Large scale triplification and interlinking of educational metadata- ARIADNE- Open Discovery Space
• Contextualization of cultural heritage metadata- Europeana (Hack4Europe!)