This document discusses Uniform Resource Identifiers (URIs) and how they are used to uniquely identify resources on the semantic web. It provides examples of URIs used by databases like DBPedia, Freebase, and Geonames to identify things like New York City. It explains that while a URI uniquely identifies a resource, accessing that URI may provide a description of the resource instead of the resource itself. URIs are a key component of the semantic web as they allow different data sources to link to each other through references to the same unique URI identifiers.

1. Unique Unambiguous Identifiers for
Semantic Web
Fariz Darari
mrlogix

2. What They Look Like
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http://dbpedia.org/resource/New_York_City
http://data.nytimes.com/N46020133052049607171
http://rdf.freebase.com/ns/en.new_york
http://sws.geonames.org/5128581/

3. What They Identify*
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http://dbpedia.org/resource/New_York_City
http://sws.geonames.org/5128581/
http://data.nytimes.com/N46020133052049607171
http://rdf.freebase.com/ns/en.new_york
*Hence unique as on title slide. See also this slide by TBL.

4. Technically, these things are called URIs:
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http://dbpedia.org/resource/New_York_City
http://data.nytimes.com/N46020133052049607171
http://rdf.freebase.com/ns/en.new_york
http://sws.geonames.org/5128581/
Then, what is a URI?
A Uniform Resource Identifier (URI) is a compact sequence of characters
that identifies an abstract or physical resource.
Tim Berners-Lee (W3C)

5. So, URIs are used to identify.
Therefore, it is perfectly fine if we could not
retrieve the New York City by accessing
some URI of the city, say,
http://dbpedia.org/resource/New_York_City
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Definition of identify - by
to serve as a means of identification for

6. Instead, what we’d get is a description about
the New York City by DBpedia:
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So, URIs are used to identify..

7. Or in format:
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So, URIs are used to identify...

8. More Examples of URIs
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9. Congrats!
You just learned about URIs that are used in
all the four basic principles of Semantic Web:
9
Source
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10. Congrats!!
You just learned about URIs that are used in
the Semantic Web Cake:
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See real picture here

11. Credits
• URI Definition http://tools.ietf.org/html/rfc3986
• 4 Basic Principles of Semantic Web (aka. Linked Data) http://dig.csail.mit.edu/2007/Talks/0108-swuri-tbl
• URIs Examples http://linkeddatabook.com/editions/1.0/
• URIs for Semantic Web http://www.med.nyu.edu/research/pdf/mainim01-1484312.pdf
• SW Levels http://www.w3.org/2001/12/semweb-fin/swlevels.png
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12. Credits (Images)
• CC-BY Icon http://upload.wikimedia.org/wikipedia/commons/thumb/1/16/CC-BY_icon.svg/120px-CC-
BY_icon.svg.png
• Twitter Icon http://www.iconfinder.com/icondetails/82332/128/twitter_icon
• Barcode Icon http://www.iconfinder.com/icondetails/40683/128/barcode_icon
• SW Icon http://www.w3.org/Icons/SW/sw-cube.png
• NYC Photo
http://th03.deviantart.net/fs71/PRE/f/2011/074/7/3/new_york_city_wallpaper_by_angelmaker666-
d3boylj.jpg
• Child Photo http://www.deankwilson.com/Blog_images/questioning_child_face_left.jpg
• TBL Photo http://mp.blogs.com/.a/6a00d83451d22169e20112796bd8f428a4-200wi
• Hand Icon http://www.iconfinder.com/icondetails/85401/128/thumb_up_icon
• RDF Icon http://www.w3.org/Icons/SW/Buttons/sw-rdf-blue.png
• SW Cake http://farm3.staticflickr.com/2280/2366732985_62f63e4179_z.jpg
• Reading Robot
http://www.sri.com/sites/default/files/imagecache/slide_home_main/project/slides/faust_mp_010712_4
90x356.jpg
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