Transcript Dewey Web Services — Overview

Dewey Summaries as
Multilingual Linked Data
Dewey Breakfast/Update
ALA Annual
July 11, 2009
Linked Data principles
• Three rules
1. Use http-URIs as names for things (identification)
2. When someone looks up a URI, provide useful information
(dereferenceability)
3. Include links to other URIs (relationships)
• Maxims
• “Raw data now!” (TBL)
• Being able to ask new question about data
• Adding information collaboratively
Linked Open Data cloud
Requirements for publishing Linked Data
- Identification
- Every data entity has a URI
- Access
- HTTP as protocol (established infrastructure: WWW)
- User agent indicates which data formats it accepts
- Representation
- for machines
- RDF as data model
- SKOS, Dublin Core, ccREL, etc. as vocabularies
- for humans
- HTML, etc.
- “Openness” of the data set
Use Cases: Basic web lookup
“If someone has the URI of that thing, what relationships
to what other objects is it useful to know about?”
(Tim Berners-Lee)
A web page for every class of the Dewey Summaries, e.g.:
<http://dewey.info/class/641/>
Use Cases: Basic linking
Example: Dublin Core metadata
<dc:title>Petrology.</dc:title>
<dc:creator>Huang, Walter Ta, 1924-</dc:creator>
<dc:subject xsi:type="http://purl.org/dc/terms/DDC">552</dc:subject>
Use of a link (URI) instead of arbitrary text
Use Cases: Basic linking
Example: Dublin Core metadata
<dc:title>Petrology.</dc:title>
<dc:creator>Huang, Walter Ta, 1924-</dc:creator>
<dc:subject rdf:resource="http://dewey.info/class/552/e16/" />
Use of a link (URI) instead of arbitrary text
Service: Dewey Summaries as Linked Data
- External summaries of DDC 22
- Main Classes, Divisions, Sections
- Accessible
- as RDF data or HTML web pages
- in 9 languages
- Reusable
- by anyone
- under terms of Creative Commons BY-NC-ND 3.0 license
Demo: Dewey Summaries as Linked Data
http://dewey.info/class/641/
http://dewey.info/class/641/about.rdf
http://dewey.info/class/641/about.en
http://dewey.info/class/641/about.sv
http://dewey.info/class/641/2009/06/about.ar.html
http://dewey.info/class/641/2009/01/about.ar.rdf
HTML view across all versions in all languages
Data view across all versions in all languages
HTML view of all versions in a specific
language
http://dewey.info/class/641/about.sv
Data view of a specific version in a specific
language
http://dewey.info/class/641/2009/06/about.ar.rdf
And it works on my BlackBerry ...
Thank you!
What would you like to do with this?
Ideas for new use cases?
Other comments, suggestions?
[email protected]