This document discusses making linked open data usable. It advocates for publishing and retrieving linked open data through application programming interfaces (APIs) that have the right abstraction level, few barriers to entry, are comprehensible through introspection, and follow consistent patterns. JSON-LD is recommended for expressing linked data through APIs because it separates the data model from the representation using contexts and frames. This allows for usability without compromising semantics. The document also recommends focusing on solving real challenges with available data that meets requirements, and designing data to be reusable by others.

1. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Publishing & Retrieving
Linked Open Usable Data
Rob Sanderson
Semantic Architect
J. Paul Getty Trust
rsanderson@getty.edu
@azaroth42

2. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Attention to Publishing & Retrieving
Ontologies
RDF
All Five LOD Stars!
LDP

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rsanderson
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IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
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We Built It … Where Are They?
https://www.flickr.com/photos/105458023@N02/10287818523/

4. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
They’re Where Everyone Else Is
https://www.flickr.com/photos/jonathangrossphotography/17204367619/

5. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
RDF: Not In My Backyard
Image By Z22 - https://commons.wikimedia.org/w/index.php?curid=30929934Title: http://manu.sporny.org/2012/nuclear-rdf/

6. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
LOUD: Linked Open Usable Data
• Just Use Federated SPARQL Queries
• Data Models and Ontologies make bad APIs
• APIs are the UIs of Developers, and need:
⭐ Correct Abstraction level for the Audience
⭐ Few Barriers to Entry
⭐ Comprehensible by introspection
⭐ Thorough Documentation with copy-able examples
⭐ Few Exceptions, instead consistent patterns
• Conflict between completeness, precision & usability…

7. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Patrick Hochstenbach, @hochstenbach

8. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Patrick Hochstenbach, @hochstenbach

9. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Usable vs Complete

10. @azaroth42
rsanderson
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IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Target Zone

11. @azaroth42
rsanderson
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IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Incremental Complexity

12. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Incremental Complexity

13. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Incremental Complexity

14. @azaroth42
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IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
What to do?
⭐ Solve actual challenges, documented as use cases
• Using data that is captured and available
• That meet institutional norms and requirements
⭐ Describe shared domain use cases consistently
• While allowing local extensions for local problems
⭐ Ensure data can be productively used
• Via easy-to-implement & maintain services
• With various easy-to-implement applications
⭐ Design for reuse by others.

15. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
JSON-LD: {}s are the new <>s
⭐ Speak to your audience in their language!
• 10% - 19% of all websites have JSON-LD data
xml api json api
(Feb 2018) https://w3techs.com/technologies/details/da-jsonld/all/all
(Nov 2017) http://webdatacommons.org/structureddata/2017-12/stats/stats.html

16. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Data Model and API?
JSON-LD contexts and frames abstract the representation
from the ontology, providing the necessary separation of
concerns between data model and API to enable usability
without compromising on semantics.

17. @azaroth42
rsanderson
@getty.edu
IIIF: Interoperabilituy
Linked Open
Usable Data
@azaroth42
rsanderson
@getty.edu
Thank You!
Rob Sanderson
rsanderson@getty.edu
@azaroth42