Embed Size (px)
Citation preview
Incorporating ARGOVOC in DSpace-based Agricultural Repositories
Dr. Devika P. Madalli&
Nabonita Guha
Documentation Research & Training CentreIndian Statistical Institute, Bangalore
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 2
Overview
Some Observation on present ontology plugin AGROVOC Thesaurus Plugin for DSpace AGROVOC in SKOS Difference between Thesaurus and Ontology Moving towards Ontology
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 3
Some Observations
Present ontology plugin integrated with DSpace 1.4 doesn’t support synonyms and related terms
It shows only broader and narrower relationship It requires the conversion of OWL or SKOS representation of
AGROVOC into the native plugin format every time AGROVOC is updated
Ideally, thesaurus input can be either in SKOS or OWL format (can be achieved by XLST)
Cron job checks updates on AGROVOC site and downloads either SKOS or OWL file
Alternatively, ontology should be displayed on the fly from the AGROVOC site (idea from Dr. Johannes Keizer)
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 4
AGROVOC Thesaurus Plug-in
To provide controlled vocabulary support in subject description in DSpace and depict: Equivalence Homographs Broader/narrower/associated relationship
To … Provide standard access points to document; & Thesaurus based Indexing & Searching
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 5
Handling Synonyms
At the time of creating the metadata The synonymous terms are added along with the standard
term
At the time of search If the user enters a non-standard term, it will be replaced
by standard term, and search is performed using the standard term
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 6
Homograph resolution (spelling same but different meaning) Can be resolved using context of the given term
At the search stage, the system will retrieve the subject string attached to the document along with the associated documents Fish – agriculture Fish – cooking Fish – decoration
Handling Homographs
AGROVOC in SKOS
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 8
SKOS
SKOS = Simple Knowledge Organization System
Provides a model for expressing the basic structure and content of concept schemes [1] in RDF syntax
Concept Scheme = thesaurus, classification scheme, taxonomy, subject heading list, terminologies, etc
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 9
SKOS: Classes
Classes [2] ConceptScheme (AGROVOC, MeSH, AAT, etc)
Concept (actual terms, e.g. animals, crops, etc)
Collection (group of concepts e.g. meat cattle)
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 10
SKOS: Properties
Properties [2] altLabel broader changeNote narrower prefLabel scopeNote hasTopConcept historyNote isPrimarySubjectOf
isSubjectOf member definition note primarySubject related subject example subjectIndicator
Thesaurus Vs Ontology
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 12
Thesaurus is …
Controlled vocabulary tools in which relationship between concept terms are shown as: Equivalence = synonyms Homographic = same spelling Hierarchical = broader -> narrower Associative relationships = related terms
Represents the terms denoting certain concepts
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 13
Ontology is …
An ontology defines the terms used to describe and represent an area of knowledge (subject matter) [3]
Model for the meaning of those terms
Definition of the vocabulary used
(Real world entity)
CattleCattle
Suckler CowSuckler Cow
Dairy CowDairy Cow
HeifersHeifers
Cow MilkCow Milk
Milk yielding cowsMilk yielding cows
COW BT
NT
NT
RT
RT
RT
Related Terms in AGROVOC for Cow
SKOS representation of AGROVOC Terms
19391939
CowsCowsskos:prefLabel
Domestic AnimalDomestic Animal
Milk yielding cowsMilk yielding cows
skos:Related
HeifersHeifers
skos:Related
Cow milkCow milk
skos:Related
CattleCattle
skos:Broader
Suckler CowSuckler Cow
skos:Narrower
Dairy CowDairy Cow
skos:Narrower
http://www.fao.org/aos/agrovoc#c_1939
COWCOW
AnimalsAnimals
subClassOf
subClassOf
WildWildDomestic AnimalDomestic Animal
subClassOf
CattleCattle
subClassOf
Cow milkCow milk
hasByproductDomainRange
HeifersHeifers
subClassOf
Milk yielding cowsMilk yielding cows
subClassOf
RDF Representation of AGROVOC Terms
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 17
Current Approach
To develop a plugin which can provide thesaural support in DSpace
Not only specific to AGROVOC, but can support any thesaurus in DSpace represented in SKOS
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 18
Moving Towards Ontology
Decision regarding the nature of Information Retrieval Document retrieval ; or Retrieval of exact information extracted from the
document
To develop a generic framework for Agriculture domain knowledge with scopes for further extension for narrower domains
To incorporate the inferencing mechanism defining certain rules (SWRL)
Uncontrolled Vocabulary
Unstructu
red
Controlled Vocabulary in formal syntax (RDF)
Structu
red
Ontology-based information search & retrieval
Semantic
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 20
References
1. Alistair Miles & Dan Brickley. SKOS Core Guide. W3C Working draft 10 May 2005. http://www.w3.org/TR/swbp-skos-core-guide
2. Alistair Miles & Dan Brickley. SKOS Core Vocabulary Specification. W3C Working Draft 2 November 2005.
http://www.w3.org/TR/swbp-skos-core-spec/
3. Dr. Leo Obrst. Presentation on the ontology spectrum & semantic models. MITRE, Information Semantics Group, January 12 & 19, 2006. http://ontolog.cim3.net/file/resource/presentation/LeoObrst_20060112/OntologySpectrumSemanticModels--LeoObrst_20060112.ppt
Nov. 10, 2006 Seventh Agricultural Ontology Service (AOS) Workshop 21
Thank You
Devika P. Madalli
Nabonita Guha
