DC-2008 Identifiers presentation

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Plus ça change, plus c'est la même chose

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DC-2008 Identifiers presentation

  1. 1. Dublin Core and other metadata schemas Mikael Nilsson < [email_address] >
  2. 2. Four rules for exposing information on the web <ul><li>Use URIs as names for things </li></ul><ul><li>Use HTTP URIs so that people can look up those names. </li></ul><ul><li>When someone looks up a URI, provide useful information. </li></ul><ul><li>Include links to other URIs. so that they can discover more things. </li></ul>
  3. 3. Uses of machine semantics <ul><li>The use of a common framework means metadata... </li></ul><ul><ul><li>from different domains </li></ul></ul><ul><ul><li>using different vocabularies </li></ul></ul><ul><ul><li>used in different technical environments... </li></ul></ul><ul><li>... can be combined without effort. </li></ul><ul><li>Ontologies </li></ul><ul><ul><li>Enable advanced processing of metadata </li></ul></ul><ul><li>Automatic discovery of term definitions </li></ul><ul><ul><li>“Follow your nose” </li></ul></ul><ul><li>Linked open data </li></ul><ul><ul><li>Giant global graph of metadata </li></ul></ul>
  4. 4. 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
  5. 5. Linked Open Data <ul><li>More than 2 billion RDF triples </li></ul>
  6. 6. 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

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