Linking library data

Linking Library Data ELAG 2011 Workshop Jindřich Mynarz @ jindrichmynarz

linked data is sooo 2009

Workshop
Introduction
Motivation
Involved technologies
Discussion
Key questions
Potential issues
Practical linking
Shared document: bit.ly/linking-library-data
Twitter hashtag: #elag2011

conversion lots about

linking little about

library links

raw data

linked data

Key technologies
URIs
RDF
SPARQL
Linked data

URIs
U niform R esource I dentifiers
<http://example.com>
"Cool URIs"
resolvable
stable
implement content negotiation

Learn how the RDF looks like
Data format for formalizing directed graphs .
Standard for data interchange on the Web.
Unit of RDF is a triple .

Step 1: a triple

Step 2: triples

Step 3: a graph

Linking Open Data cloud diagram, by Richard Cyganiak and Anja Jentzsch. http://lod-cloud.net/ Step 4: linked data

Learn how to SPARQL
Query language for RDF
PREFIX ex: <http://example.com>
SELECT [DISTINCT] ?what [FROM ?where]
WHERE {
?triplePattern
}
[LIMIT ?limit]
[ORDER BY ?variable]

Linked data
Use URIs as names for things
Use HTTP URIs so that people can look up those names.
When someone looks up a URI, provide useful information , using the standards (RDF, SPARQL)
Include links to other URIs. so that they can discover more things.

Linking data
linking...
is a continuous integration of heterogeneous dataspaces?
creates context ?
is a job for librarians ? Or machines ?
is good ?

@href is a blunt instrument

typed links

= identity
~ similarity
> hierarchy
? aboutness
typed links

Discussion
How to find datasets suitable for interlinking?
How to make my dataset worth linking to ?
How to encourage others to link to my data?
What is the added value of links?
How to determine the quality of a link?
How to maintain links?

find and examine data

added value of links

link baiting

link maintenance

Linking
Record linkage, identity resolution, duplicate detection, instance matching , co-reference detection
Determinism:
Deterministic (e.g., dictionary-based)
Probabilistic (e.g., graph matching)
Level:
Schema (e.g., ontology mapping)
Instances (e.g., record linkage)

Linking
Untyped links to typed links.
Literals to links.
Links to other links.

Interlinking with Silk
Silk is an interlinking framework for instance matching .
Uses the link specification language to describe the interlinking process.
Powerful and relatively easy-to-use.

Link specification language
Your turn!

connect the dots

get this

or this

the end.

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Linking library data

by Jindřich Mynarz

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Linking library data Presentation Transcript