Session 4/4. When RDFa. An introductory one day workshop on RDFa and its relevance, organised and delivered by Netskills.

1. When RDFa?

2. When RDFa, and how much
Session 4/4

3. RDFa scenarios
RDFa use cases
W3C working draft 30 March 2007
‣ basic structured blogging
‣ publishing an event—overriding some of the rendered data
‣ content management metadata
‣ self-contained HTML fragments
‣ web clipboard
‣ semantic wiki
‣ augmented browsing for scientists
‣ advanced data structures
‣ publishing a RDF vocabulary
http://www.w3.org/TR/xhtml-rdfa-scenarios/ http://rdfa.info/wiki/Rdfa-use-cases

4. RDFa projects
Examples in-the-wild
Real-world RDFa examples showing how RDFa is used in different
places for different purposes
‣ science, law, publications
‣ social media: blogs, wikis, mailing lists
‣ multimedia
‣ government
‣ other
http://rdfa.info/wiki/Examples-in-the-wild

5. http://ny-pictures.com/nyc/photo/

6. Big RDFa related projects
The US Library of Congress
The Library of Congress is the USA’s oldest federal cultural institution and serves as
the research arm of Congress. It is also the largest library in the world, with
millions of books, recordings, photographs, maps and manuscripts in its collections.
The Library of Congress Authorities and Vocabularies service enables both humans
and machines to programmatically access authority data at the Library of Congress.
This service is influenced by—and implements—the Open Linked Data movement's
approach of exposing and inter-connecting data on the Web via dereferenceable
Uniform Resource Identifiers (URIs).
http://id.loc.gov/authorities/

7. Library of Congress subject headings triples, 415 Mb file!
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF
xmlns:dcterms="http://purl.org/dc/terms/"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
>
<rdf:Description rdf:about="http://id.loc.gov/authorities/sh85045301#concept">
<dcterms:created rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">1986-02-11T00:00:00-04:00</dcterms:created>
<skos:narrower rdf:resource="http://id.loc.gov/authorities/sh85069326#concept"/>
<skos:closeMatch rdf:resource="http://stitch.cs.vu.nl/vocabularies/rameau/ark:/12148/cb12426312t"/>
<skos:inScheme rdf:resource="http://id.loc.gov/authorities#conceptScheme"/>
<skos:inScheme rdf:resource="http://id.loc.gov/authorities#topicalTerms"/>
<rdf:type rdf:resource="http://www.w3.org/2004/02/skos/core#Concept"/>
<skos:prefLabel xml:lang="en">Ethnology--Jamaica</skos:prefLabel>
<owl:sameAs rdf:resource="info:lc/authorities/sh85045301"/>
<dcterms:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">1986-02-11T00:00:00-04:00</dcterms:modified>
</rdf:Description>
<rdf:Description rdf:about="http://id.loc.gov/authorities/sh85069326#concept">
<dcterms:created rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">1986-02-11T00:00:00-04:00</dcterms:created>
<skos:broader rdf:resource="http://id.loc.gov/authorities/sh85045301#concept"/>
<skos:closeMatch rdf:resource="http://stitch.cs.vu.nl/vocabularies/rameau/ark:/12148/cb119618863"/>
<skos:inScheme rdf:resource="http://id.loc.gov/authorities#conceptScheme"/>
<skos:inScheme rdf:resource="http://id.loc.gov/authorities#topicalTerms"/>
<rdf:type rdf:resource="http://www.w3.org/2004/02/skos/core#Concept"/>
<skos:prefLabel xml:lang="en">Jamaicans</skos:prefLabel>
<owl:sameAs rdf:resource="info:lc/authorities/sh85069326"/>
<dcterms:modified rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">1992-08-07T14:52:10-04:00</dcterms:modified>
</rdf:Description>
http://id.loc.gov/authorities/search/

8. Linked data
The New York Times and linked data
As of 13 January 2010, The New York Times has published
approximately 10,000 subject (people, organisations, locations)
headings as linked open data under a CC BY license.
‣ This includes both RDF documents and human-friendly HTML versions.
‣ Each subject heading published on data.nytimes.com is associated with a
Uniform Resource Identifier (URI) that is unique to that subject heading.
‣ When this URI is dereferenced in a web browser, an HTML document
describing the subject heading is returned. Appending ".rdf" to the URI
causes an RDF/XML document to be returned.
http://data.nytimes.com/

9. Linked data
Build your own NYT linked data application
EVAN SANDHAUS, March 30 2010
Now that we’ve published nearly 10,000 of our tags as Linked Open Data, you’re
probably wondering what kind of cool applications you can build with this data. To
help you get started (and since linked data applications are a little different from
your average Web application), we thought we’d provide a sample application and
detailed information about how we built it.
http://open.blogs.nytimes.com/2010/03/30/build-your-own-nyt-linked-data-application/

10. Official RDFa deployment in UK
RDFa and linked data in UK government
web-sites
Mark Birbeck, Nodalities Magazine, 29 July 2009
The UK government’s Central Office of Information had a straightforward problem to
solve: how could they create a centralised web-site of information that the public
could search and access, when the source of that information could be any
government department database or any public sector web-site?
By using RDFa to address the challenge of making distributed data available in one
place, the COI avoided having to make changes to each department's systems. But
once each department is publishing RDFa, it becomes possible for third parties to
consume that information however they see fit. Such a flexible architecture is
crucial in the age of open government, and is a cornerstone of linked open data.
http://blogs.talis.com/nodalities/2009/07/rdfa-and-linked-data-in-uk-government-web-sites.php

11. Official RDFa deployment in UK
TSO announces major new platform to
accelerate open data drive
TSO partners with Garlik on hosted "trillion triple" RDF platform, 18 January 2010
TSO (The Stationery Office), the public sector division of Williams Lea, has today
announced a partnership with Garlik, the leading semantic technology innovator, to
launch what is believed to be the world's most scalable, securely hosted RDF
platform for use by UK Central and Local Government departments. As the largest
publisher in the UK of public sector documents (over 8,000 titles a year), TSO has
taken this proactive step to provide its core public sector customers with the ability
to participate with confidence in the Government's open data initiative.
http://www.tso.co.uk/press/latestnews/archive/2010/triplestore/

12. Commercial RDFa deployment in UK
RDFa adoption
21 January 2010
RDFa

13. Important questions
Microformats and RDFa: Adding Richer
Structure To Your HTML Pages
Brian Kelly (UK Web Focus), 25 March 2010
But before investing time and energy into using RDFa the Web manager will need
answers to the following questions.
1. What benefits can this provide?
2. What vocabularies do we need to use and how should the data be described?
3. What tools are available which can process the RDFa which we may chose to
create?
http://ukwebfocus.wordpress.com/2010/03/25/microformats-and-rdfa/

14. The “open data” movement
http://www.ted.com/talks/tim_berners_lee_the_year_open_data_went_worldwide.html