1. Information Organization
LBSC 670
Information Organization

2. Today Explore ontology creation Classification Thoughts and CV
Overview & History
Related concepts
Examples
A note on MARC specifications

3. Amazon Xray http://www.youtube.com/watch?v=AbzOLua2baw
On the fly indexing
INLS 520 – Fall 2007
Erik Mitchell

4. Knowledge Organization
“tools that present the organized interpretation of knowledge structures” (Hjørland)
“classification schemes that organize materials at a general level…, subject headings that provide more detailed access, and authority files that control variant versions of key information” (Hodge)

5. A+ A good CV. . . Removes ambiguity
Defines relationships between things
Contextualizes information A+
Removes ambiguity
Synonyms, Homonyms, polysemes,
Defines relationships
Equivalence, hierarchical, associative (BT, NT, RT, CR) reciprocity,
Provides context
Category, scope, qualifiers, modifiers, scope notes

6. Case study - MeSH

7. Class exercise Protégé overview Replication of the Glosso-Thesaurus
Orientation
Object types (Classes, Slots, Instances)
Relationships (hierarchies, associative)
Replication of the Glosso-Thesaurus
Visit the Boxes & Arrows Glosso Thesaurus
Look at the data there and come up with a structure in Protégé that allows replication of the thesaurus
Some issues to consider are:
Do you want terms to be classes or instances?
What is the easiest way to show the relationships (broader term, narrower term, etc)?
Do you need to allow multiple relationships for a given type (BT, RT, etc)?
If you have multiple classes, at what level should you create the slots?

8. Thesauri Guides
National Information Standards Organization. (2005). Guidelines for the construction, format, and management of monolingual thesauri. ANSI/NISO Z Bethesda, MD: NISO Press.
Aitchison, Jean & Gilchirist, Alan. Thesaurus Construction: A Practical Guide. 3rd ed. London: Aslib, 1997.
Willpower Information Management Consultants

9. Thesaurus Exploration
Protégé introduction and tour
What is protégé?
What is it used for?
How will we use it this semester?
Search for mississippi
Show the hierarchical relationships
Open protégé
Give a short tour

10. When is a CV an Ontology? “The study of being or existence”
“A conceptualization of a specification” (Gruber)
“An ontology formally defines a common set of terms that are used to describe and represent a domain.” (OWL)
Computational application of “Necessary and Sufficient” definitions

11. OWL? Web Ontology Language
W3c: “semantic markup language for publishing. . .ontologies on the www”
A built-in language:
Class
subClassOf
disjointWith
Encoded in RDF or XML

12. OWL in Protege Classes Individuals Properties
Sets that contain individuals – Taxonomic, superclass/subclass
Individuals
Examples of a defined concept
Properties
Binary relationship (hasBase,hasTopping) between individuals
Similar to Slots in Protégé 3.4

13. DC as OWL Classes: DC Document Model Object properties: relationships
Data properties: DC elements
Individuals: Actual DC records

14. Assignment 3 - Ontologies
Group or individual
Focused on skill development
Complete tutorial: Ch 1-6 (P1-88)
Reflective statement – Migration of LCSH into OWL form
Making a change in Assignment 3
Functionally the same
Less creative focused but more process focused
What you will get out of this is an in-depth understanding of ontology elements
Some challenges – This tutorial is not 100% in sync with the current version of protégé.
Some differences : Classify = Reasoner,
Open inferred hierarchy Window >> class views >> class hierarchy (inferred)
Grading:
An A – You make it through CH6 and your ontology is largely similar to the tutorial (e.g no errors)
A B+ – You make it through CH 4 (p75) and things work