Linked Data 1 : Hva og hvorforDavid.massey@jbi.hio.no

KoG31 Uke 6, 2011

Metadata is

King!

Objekt

Egenskap

Verdi

Hvorfor?

Identifiserer

Gjenfinner

Bruker

Vi velger egenskaper etter objektet vi skal beskriver og hva beskrivelsen skal brukes til

Metadata semantikk

Hva betyr Tittel?

Metadata struktur

Må Tittel være med?

Kan vi gjenta Tittel?

Hvordan skal verdien for Tittel utformes?

Metadata syntaks

Hvordan skal Tittel nedtegnes?

Syntaks

Syntaks

Syntaks

Standards are also Kings!

Kommunikasjon

Datamaskiner kommuniserer vha Internett – slutten 1960-tallet

Men hva skulle Internett brukes til?

Cern, Sveits – 1990 – Tim Berners-Lee

Utveksling av dokumenter

Dokumenter + lenker

U2

<band>U2</band>

<plane>U2</plane>

HTML

Beskriver struktur i dokumenter

<h1> Hovedoverskrift

<p> Avsnitt

<ul> Usortert liste

<li> Listepunkt

<table> Tabell

<tr> Rad i en tabell

<td> Datacelle i en tabell

…

http://en.wikipedia.org/wiki/Norway

<table>

…

<tr>

<th>Population</th>

</tr>

<tr>

<td>2011 estimate</td>

<td>4,936,000 (116th)</td>

</tr>

…

</table>

Linked data

Beskriver objekter med egenskaper og verdier

<rdf:Description rdf:about="http://dbpedia.org/resource/Norway"><dbpprop:populationEstimate>4,936,000</dbpprop:populationEstimate></rdf:Description>

Dokument Data

table Description

tr about

th populationEstimate

td

Dokumenter er for menneske, data er for datamaskiner

Hvorfor?

”We need to help machines to understand the web so machines can help us understand things.”

Raimond og Smethurst, BBC, 2009

(http://www.bbc.co.uk/blogs/radiolabs/s5/linked-data/s5.html)

Semantisk Web

”I have a dream for the Web [in which computers] become capable of analyzing all the data on the Web – the content, links, and transactions between people and computers. A ‘Semantic Web’, which should make this possible, has yet to emerge, but when it does, the day-to-day mechanisms of trade, bureaucracy and our daily lives will be handled by machines talking to machines. The ‘intelligent agents’ people have touted for ages will finally materialize."

Tim Berners-Lee, Scientific American, 2001

(http://www.scientificamerican.com/article.cfm?id=the-semantic-web)

Science Fiction?

Men, hva har dette med bibliotek å gjøre?

Siloer

"Nobody else frets over whether Google 'wants' their data. They just put it on the real web, not on some bullshit mid-90s dark web."

Tim Spalding, Skaperen av LibraryThing, 2009

(http://serials.infomotions.com/ngc4lib/archive/2009/200910/1678.html)

"The coolest thing to do with your data will be thought of by someone else."

Rufus Pollock

(http://blog.paulwalk.net/2007/07/23/%E2%80%9Cthe-coolest-thing-to-do-with-your-data-will-be-thought-of-by-someone-else%E2%80%9D/)

http://bokelskere.no/

Neste gang: Linked data 2 : Hvordan

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