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Linked Data Linked Data

Linked Data - PowerPoint Presentation

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Linked Data - PPT Presentation

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

linked data http rdf data linked rdf http links resource org uris web viaf science description framework creating laura

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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 CoyleSlide22
Slide23

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