punkish: Community Ontology

name: intro
class: center, middle

# Community Ontology
##

University of Wisconsin-Madison • February 2007

Puneet Kishor (Plazi) and Lewis Friedland, School of Journalism and Mass Communications, UW-Madison

Released under a [CC0 Public Domain Dedication](https://creativecommons.org/publicdomain/zero/1.0/).

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## What is "Ontology"?

* The terms used to describe and represent an area of knowledge
* Includes… definitions of basic concepts in the domain and the relationships among them
* Encodes knowledge *in* a domain and also knowledge that *spans* domains
slidehandout:

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## What is "Community"?

* An aggregation of organizations, people, locations, and relationships between them
* Is usually physical, but can also be logical

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## "Community Ontology"

* The terms used to describe and represent knowledge of…
* entities and relationships among them in…
* an aggregation of organizations, people, locations, and relationships between them

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## What is Resource Description Framework?

* a framework for representing information in the Web
* a general-purpose language for representing information in the Web
* allows anyone to make statements about any resource

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## RDF is a collection of triples

In Perl
<pre><code>
%ball = (
  shape => "round",
  color => "red",
  feels => "squishy",
  taste => "yucky",
);
</code></pre>

In RDF

* the "ball" has a property called "shape" whose value is "round"
* the "ball" has a property called "color" whose value is "red"
* the "ball" has a property called "feels" whose value is "squishy"
* the "ball" has a property called "taste" whose value is "yucky"

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## RDF is a collection of triples

In RDF

* *subject* (the "ball") – an RDF URI reference or a blank node
* *predicate* (the "shape," "color," or "feels" properties) – represented by RDF URI references
* *object* ("round," "red," or "squishy," the values of the corresponding predicates) – represented by RDF URI references, literals or blank nodes

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## RDF is a collection of triples

![RDF Triple Graph](rdf_triple_graph.png)

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## Describing an Entity

In RDF

A bundle of triples can describe an entity uniquely
Just like in Perl a hash can
<pre><code>
%ball = (
  shape => "round",
  color => "red",
  feels => "squishy",
  taste => "yucky",
);
</code></pre>