Semantic Web Overview

Open Data Group – 23rd Feb 2011@ianibbo

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Overview

Scene Setting

Questions you should be able to answer at the end

Major Aspects

Conceptual Model and VisionThe (Distributed) Graph Model

ImplementationDescriptions & Descriptive Bindings - RDF

RDFXML, RDFa, n3, turtle, ntriples

Storage

Retrieval

Scene Setting

Semantic Web

Whats it good for?Anyone can say anything – about anything (And thats a

good thing?)

Ability to describe unforseen classes

Whats it not good for?Tabular Data actually not so bad

Updating Tabular Data more of an issue

Frequent/atomic/isolated Updates (anecdotally)

Transactional Capabilities

Modern Search Capabilities – Spatial, Text, other.

Conceptual Model - Examples

<ThisPresentation> <DeliveredBy> <Ian>

<Ian> <MemberOf> <GistFoundation>

<GistOpenDataMeetup2> <Date> '23-Feb-2011#date'

<Ian> <FavoriteDrink> <Moonshine>

<GISTLab> <MaxCapacity> '70#int'

<GISTLab> <Hosted> <GistOpenDataMeetup1>

<GISTLab> <Hosted> <GistOpenDataMeetup2>

<GISTLab> <Hosted> <GistOpenDataMeetup3>

Conceptual Model - Principles

URI, URI, URI, URI

ISBN's, ISSNs - urn:issn:1535-3613

The description and the thing described are not the same thing

Well known strategies for modelling.<ian> == http://ianibbo.me

<ian> == http://ianibbo.me#me

<Subject> <Predicate> <Object>

<URI> <URI> <URI|Literal>

Conceptual Model

URI, URI, URI, URI

The description and the thing described are not the same thing

Well known strategies for modelling.

<Subject> <Predicate> <Object>

Notes

http://www.w3.org/2002/12/rdf-identifiers/