Linked Data

farmpaintlickInternet και Εφαρμογές Web

21 Οκτ 2013 (πριν από 3 χρόνια και 10 μήνες)

78 εμφανίσεις

Linked Data

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

Basic Terms

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


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
linked

LOD
-
LAM

Linked Open Data

in

Libraries Archives Museums

#lodlam

URI

Uniform Resource Identifier



A string of characters used to identify a name
or resource on the Internet

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.”

Wikipedia


RDF

Defined statements compromising a
subject, a predicate (property), and
an object.


These statements are called “triples”

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
Salo





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

Web of documents

vs.

Web of data

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



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 Nimsakont

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”

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].


Linked Data is Explicit

Laura J. Smart

Women in Science

isCreatorOf

Women in Science

sdsc.edu/
ScienceWomen

isTitleOf

Object


predicate
-

subject


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/ScienceWomen


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>



It’s the data, stupid.

“We’re not dealing with records
anymore. We are working with
interrelated nodes of data”


Diane
Hillmann

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 Coyle


Thinkbase

http://thinkbase.cs.auckland.ac.nz/start.jsp

Benefits of creating/using Linked Data


Sharable


Extensible


Reusable


Multi
-
lingual


Reduce

redundancy


Improve

discoverability


Sophisticated

navigation


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)


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.html



How to?

Other prerequisites: HTML. URIs.


“Learn about Resource Description Framework.

Never look back.”


Rurik
Greenall
, Norwegian Institute Science & Technology

Berners
-
Lee Basic Linked Data Principles

1.
Use URIs as names for things

2.
Use HTTP URIs so that people can look up
those names

3.
When someone looks up a URI, provide
useful information, using the standards (RDF,
SPARQL)

4.
Include links to other URIs. so that they can
discover more things.

Source: Heath &
Bizer

http://linkeddatabook.com/editions/1.0/

The process: 1
st

get your data

Feynman, Richard Phillips, 1918
-
1988

LCCN: n 50002729


http://viaf.org/viaf/44298691


http://lccn.loc.gov/n50002729


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:

The process: Expose that data

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

Thanks!

library.caltech.edu/laura