for Libraries Archives Museums Learning objectives Define the concept of linked data State 3 benefits of creating linked data and making it available Outline the process of creating LD State how to make use of LD created by others ID: 579113
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Slide1
Linked Data
for Libraries, Archives, MuseumsSlide2
Learning objectives
Define the concept of linked data
State 3 benefits of creating linked data and making it available
Outline the process of creating LD
State how to make use of LD created by othersSlide3
Basic TermsSlide4
Linked Data (LD)
"a term used to describe a recommended best practice for exposing, sharing, and connecting pieces of data, information, and knowledge on the Semantic Web using URIs and RDF."
http://linkeddata.org/faq
Slide5
Linked
Open Data (LOD)
Linked Data that is explicitly published under an open license.
Not all Linked Data will be open, and not all Open Data will be linkedSlide6
LOD-LAM
Linked Open Data
in
Libraries Archives Museums
#lodlamSlide7
URI
Uniform Resource Identifier
A string of characters used to identify a name or resource on the InternetSlide8
RDF
Resource Description Framework
“a metadata data model. It has come to be used as a general method for conceptual description or modeling of information that is implemented in web resources, using a variety of syntax formats.”
WikipediaSlide9
RDF
Defined statements compromising a subject, a predicate (property), and an object.
These statements are called “triples”Slide10
SPARQL
SPARQL protocol and RDF Query Language
SPARQL Endpoint: “URL for a given set of RDF data that you can send queries to and get answers from”
Dorothea
SaloSlide11
Linked Data (LD)
Linked data “describes a method of
publishing structured data
so that it can be interlinked and become more useful. It builds upon standard Web technologies such as HTTP and URIs, but rather than using them to serve web pages for human readers, it extends them to share information in a way that can be read automatically by computers. This enables data from different sources to be connected and queried
”
Wikipedia definition Slide12
Web of documents
vs.
Web of dataSlide13
resource
resource
resource
resource
resource
links to
links to
links to
links to
Diagram by Emily Nimsakont
links to
links to
links to
links to
links to Slide14
data
links to
links to
links to
links to
data
data
data
data
data
data
data
data
data
data
data
data
data
data
Diagram by Emily NimsakontSlide15
Relationship grammar
Resource A
Resource B
Describe resources using interrelated “statements” (RDF triples)
Use URIs – unique globally managed identifiers as the “words” of the statement
relatedTo
Slide by DCMI tutorial “What makes the Linked Data Approach Different” Slide16
Traditional metadata = Implicit Relationships
MARC Bibliographic Record
100 10 Smart, Laura J.
ǂq
(Laura Jean),
ǂd
1971-
245 00 Women in Science
ǂh
[electronic resource].Slide17
Linked Data is Explicit
Laura J. Smart
Women in Science
isCreatorOf
Women in Science
sdsc.edu/
ScienceWomen
isTitleOf
Object – predicate - subjectSlide18
Triple with URIs
Laura J. Smart
http://viaf.org/viaf/171972263
is creator of
http://purl.org/dc/terms/creator
Women in Science
http://www.sdsc.edu/ScienceWomenSlide19
Under the hood
<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:dc="http://purl.org/dc/elements/1.1/"
<rdf:Description rdf:about="
http://www.sdsc.edu/ScienceWomen
">
<dc:title>Women in Science</dc:title>
<
dc:creator
dc:source="
http://viaf.org/viaf/171972263
/" rdfs:Literal="Laura J. Smart" />
</rdf:Description>
</rdf:RDF>Slide20
It’s the data, stupid.
“We’re not dealing with records anymore. We are working with interrelated nodes of data”
Diane
HillmannSlide21
What does it really look like?
“
This is kind of like asking what electricity looks like: it doesn't so much look like anything, as it makes certain things possible”
Karen CoyleSlide22Slide23
Thinkbase
http://thinkbase.cs.auckland.ac.nz/start.jspSlide24
Benefits of creating/using Linked Data
Sharable
Extensible
Reusable
Multi-lingual
Reduce
redundancy
Improve
discoverability
Sophisticated
navigationSlide25
Benefits of creating/using Linked Data
Enhanced publications
Facilitate research
Separate
semantics from syntax
Persistent URIs an aid to digital preservation
Drive users to your site
Collaborate with less licensing hassle (LOD)Slide26
All the kids are doing it
“The new bibliographic framework project will be focused on the Web environment, Linked Data principles and mechanisms, and the Resource Description Framework (RDF) as a basic data model.”
LC Bibliographic Framework for the Digital Age
http://www.loc.gov/marc/transition/news/framework-103111.htmlSlide27
How to?
Other prerequisites: HTML. URIs.
“Learn about Resource Description Framework.
Never look back.”
Rurik
Greenall
, Norwegian Institute Science & TechnologySlide28
Berners-Lee Basic Linked Data Principles
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. Slide29
Source: Heath &
Bizer
http://linkeddatabook.com/editions/1.0/ Slide30
The process: 1
st
get your data
Feynman, Richard Phillips, 1918-1988
LCCN: n 50002729
http://viaf.org/viaf/44298691
http://lccn.loc.gov/n50002729Slide31
The process: Get your data into RDF/XML
From here:
Robert Phillips http://lccn.loc.gov/
n00014131
Creator http://purl.org/dc/terms/creator
Book title http://openlibrary.org/books/OL11358296M
Physical biology of the cell
To here: Slide32
The process: Expose that dataSlide33
Learning objectives
Define the concept of linked data
State 3 benefits of creating linked data and making it available
Outline the process of creating LD
State how to make use of LD created by othersSlide34
Thanks!
library.caltech.edu/laura