Semantic Web URIs



Tim Berners-Lee



Decentralized Information Group
MIT Computer Science and Artificial Intelligence Laboratory


How the web Works

How the Semantic Web works

Tree Vs Web

OO systemsSemantic Web
Information hidingInformation sharing
Social HierarchiesSocial web
Top-down elaborationTop-down, Bottom-up & middle-out
Fixed slotsAnyone can say anything about anything
Can't be a webCan be a tree
Info stored with subjectCan also be stored anywhere else
One ID per objectThings can have many URIs

Put aside Object Oriented and XML paradigms.

URI of Thing to URI of document

Two alternatives

Do NOT confuse the URI of a thing and the URI of a web page about it.

Each URI identifies one thing only

Hash vs Slash

Criteria for Choosing URIs

Persistence tips

See also: W3C TAG finding Metadata in URIs, W3C Persistence Policy

Multiple URIs for the same thing

Be part of the Semantic Web

Persitence - examples: discuss

What to serve: Linked data

  1. Use URIs as names for things
  2. Use HTTP URIs so that people can look up those names.
  3. When someone looks up a URI, provide useful information.
  4. Include links to other URIs. so that they can discover more things.

Examples of linked data

Lots of data? SPARQL service

See Jim Melton's W3C Tech Plenary talk ( slides and XTech paper.)

Self-describing Web

Remember web architecture


More Information

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