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Advanced InformationSystems Laboratory GeoSpatiumLab S.L.
ThManager
University of ZaragozaComputer Science and Systems Engineering
DepartmentAdvanced Information Systems Laboratory
(IA3)http://iaaa.cps.unizar.es/
GeoSpatiumLab S.L.http://www.geoslab.com/
http://iaaa.cps.unizar.es/http://www.geoslab.com/
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Outline
IntroductionCapabilitiesConclusion
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Introduction to thesauri
„ A thesaurus is a set of terms that describe the vocabulary of
a controlled indexing language, formally organized so that the a
priori relationships between concepts (for example synonymous
terms, broader terms, narrower terms and related terms) are made
explicit“ [ISO 2788]Used to improve the precision and recall of
information retrieval in digital libraries
provide a uniform and consistent vocabulary for indexing
metadata ("description of the data holdings“) supply users with a
suitable vocabulary for the retrieval. expansion of users queries
by automatically adding new terms to the query
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ThManager
ThManager facilitates the management of knowledge organization
systems
thesauri and other types of controlled vocabularies, such as
taxonomies or classification schemes
In particular, it facilitates the creation and visualization of
SKOS RDF vocabularies
a W3C initiative for the representation of knowledge
organization systems using the Resource Description Framework
(RDF)
C on c e p tS c h em e
C on c ep t
rd f: lab e l
s k os .p re fla b e l
s k os .a ltL ab e l
s k os .s c op eN o te
s k os .b roa d er
s k os .n a rrow e r
s k os .re la ted
s k o s .d e fin it io n
s k o s .h as Top C on c ep t
d c :t it led c :p u b lis h e r.. .
s k o s .e xam p le
s k os .in S c h em e
s k os :s ym b o l (d c m iTyp e :im ag e)
s k os .p re fS ym b o l
s k os .a ltS ym b o l
D u b lin C ore M od e l
http://www.w3.org/2004/02/skos/
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General features
Distributed as an Open Source tool through SourceForge.net
http://thmanager.sourceforge.net/Developed in JavaMulti-platform
(Windows, Unix)
Storage of metadata and thesauri is managed directly trough file
system
MultilingualJava internationalization methodologyCurrently:
Spanish, English, (procedure to support new languages)
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Capabilities
Repository of available thesauriDescription of thesauri by means
of metadata Browsing of thesaurus contentEdition of thesaurus
contentExchange of thesauri according to SKOS formatInterconnection
of thesauri through WordNetlexical database
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Repository of available thesauri
Main window of the applicationBrowser of available thesauri in
the local repository
Allowed operationsSelection of thesauri for ulterior operations
(browse content, export, delete, …)Sorting/filtering of thesauri
according to descriptors values (columns)
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Description of thesauri by means of metadata
Each thesaurus is described by means of a metadata application
profile of Dublin Core
http://thmanager.sourceforge.net/docthesaurusdc_en.html
Metadata can be either visualized in HTML or edited through a
form
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Browsing of thesaurus content
It allows the browsing of terms with different viewers (language
sensitive)
Hierarchical viewera tree showing the hierarchical structure of
thesaurus concepts
Alphabetic viewerlist of concepts alphabetically ordered in the
selected language
Search toolThe searching process is based on preferred labels
allowing the following criteria: “equals”, ”starts with”and
“contains”
For each selected conceptIt shows all the propertiesIt allows
the navigation to the related concepts by means of hyperlinks
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Hierarchical viewer
a tree showing the hierarchical structure of thesaurus
concepts
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Alphabetic viewer
list of concepts alphabetically ordered in the selected
language
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Search toolThe searching process is based on preferred labels
allowing the following criteria: “equals”, ”starts with” and
“contains”
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Edition of thesaurus content
The tool provides an edition interface to modify the content of
a thesaurus:
creation of concepts deletion of conceptsedition of properties
and relations
broader and narrower relations to define a hierarchical
structure of concepts.mark concepts as top concepts
o broader concept of a micro-thesauruso or concepts in a plain
list
preferred label, alternative label, definition and scope note as
multilingual properties
o structure: property type + language + valuenotation
properties
o useful for creating classification schemes that provide
multiple coding of terms
o example: ISO-639 list of languages has 2-letter and 3- letter
codes
o structure: type (URI) + value
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Edition of thesaurus content
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Exchange of thesauri
Exchange of thesauri according to SKOS format Import/export
operations include metadatadescribing each thesaurus
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Interconnection of thesauri through WordNet lexical database
Thesauri are intended for the homogeneousclassification of
resources
They are used to fill metadata keywordsHowever, there is still
heterogeneity in metadata keywords
Metadata creators use different thesauri in different
application domainsIf metadata catalogs provide access to general
public
Queries may not contain same terms as keywords in metadata
records
A possible solution to fill the semantic gapInterconnection of
thesauri through a general purpose lexical ontology
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Extraction of related concepts in Wordnet
ThManager generates an automatic mapping of thesaurus concepts
against the concepts of Wordnet lexical databaseThis functionality
is activated through the import dialog
Other knowledgerepresentation
models
Thesaurus 1Thesaurus 2Thesaurus N
Controlled list 1Controlled list 2
Controlled list NWordNet
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Extraction of related concepts in Wordnet
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Conclusions
ThManager is a flexible tool to manage thesauri
It provides enhanced functionality forthe improvement of
classificationsTested with well known thesauri
EEA - GEMET (General MultilingualEuropean Thesaurus), FAO
–AGROVOC, UNESCO Thesaurus, European Commission - EUROVOC
This tool can be easily integrated in other tools
It is integrated within CatMDEdit toselect the appropriate terms
for metadata elementsAccesible as a Web Service (Web Ontology
Service) for integrationwithin Web applications that
requireselection of controlled vocabularies
ThManagerOutlineIntroduction to thesauriThManagerGeneral
featuresCapabilitiesRepository of available thesauriDescription of
thesauri by means of metadataNúmero de diapositiva 9Browsing of
thesaurus contentHierarchical viewerAlphabetic viewerSearch
toolEdition of thesaurus contentEdition of thesaurus
contentExchange of thesauriInterconnection of thesauri through
WordNet lexical databaseExtraction of related concepts in
WordnetExtraction of related concepts in WordnetConclusions
