DC-2008 Identifiers presentation

Dublin Core and other metadata schemas Mikael Nilsson < [email_address] >

Four rules for exposing information on the web

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.

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

Uses of machine semantics

The use of a common framework means metadata...

from different domains

using different vocabularies

used in different technical environments...

... can be combined without effort.

Ontologies

Enable advanced processing of metadata

Automatic discovery of term definitions

“Follow your nose”

Linked open data

Giant global graph of metadata

Follow your nose http://xmlns.com/foaf/0.1/knows RDF Schema label comment range HTML http://example.com/persons#john http://example.com/persons#gordon FOAF specification http://xmlns.com/foaf/0.1/knows “ Knows” “ A person known by this person (indicating some level of reciprocated interaction between the parties)” foaf:Person

Linked Open Data

More than 2 billion RDF triples

Example: From XML to graphs <LearningResource grddl:transform=”http://yyy/mlr.xsl” > <Title>A book</title> <Contribution> <Date>2008-09-03</Date> <Entity> <Name>John Smith</Name> </Entity> </Contribution> </LearningResource> http://yyy/mlr.xsl foaf:name foaf:mbox foaf:knows title contribution date entity name foaf:mbox foaf:knows http://example.com/persons#john “ John Smith” “ [email_address] ” http://example.com/persons#gordon My learning resource Contribution A http://example.com/persons#john “ A book” “ John Smith” “ 2008-09-03” “ [email_address] ” http://example.com/persons#gordon My learning resource Contribution A Person B “ A book” “ John Smith” “ 2008-09-03” title contribution date entity name