Controlled Vocabularies in Astronomy - PowerPoint Presentation

Controlled Vocabularies in Astronomy
Controlled Vocabularies in Astronomy

Controlled Vocabularies in Astronomy - Description


Terrier Workshop 24 th October 2007 Alasdair J G Gray Vocabularies in astronomy Generating machine processible vocabularies Exploring with vocabularies Future work Overview Astronomical Vocabularies ID: 548578 Download Presentation

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skos vocabularies terms vocabulary vocabularies skos vocabulary terms aoim data term aak astronomical broader buri bname ivoa navigation sealife

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Slide1

Controlled Vocabularies in Astronomy

Terrier Workshop: 24

th

October 2007

Alasdair J G GraySlide2

Vocabularies in astronomy

Generating machine processible vocabularies

Exploring with vocabulariesFuture work

OverviewSlide3

Astronomical Vocabularies

Many existing vocabularies

Astronomy and Astrophysics keywords (AAk)

Astronomical outreach imagery metadata tags (AOIM)

International Astronomical Union Thesaurus (IAU)

Universal content descriptors (UCDs)Etc.

Created for specific purposes

Tagging journal articles (AAk)

Tagging images (AOIM)

Library cataloguing and searching (IAU)

Describing data source column content (UCDs)

Many othersSlide4

Application Problem

Requirements

Issues

Search for information using keywords

Return data from all available data sources

Navigate result using

Generalisation: retrieve more data

Specialisation: reduce data by selecting specific topic

Related terms

A data source is marked-up in one vocabulary

Need to combine information from multiple sources

Similar terms appear in the different vocabularies

Vocabularies have different structuresSlide5

Capture vocabulary structureBroader term/Narrower term relationship

Related term relationship

Use/Use for relationship Synonym/Alternative term

Standardised representation

OWL: Rigid defined semantics, very expressive

SKOS: Loose semantics, highly explorableVisualisation/exploration toolsInter-vocabulary mappings (open issue)

Representing VocabulariesSlide6

Many differentFormats

Web page

Word document

PDF document

Structures

Implicit/explicitHierarchical

Collections

Astronomy Source

VocabulariesSlide7

Flat xml files published by Frederic Hessman

Added structure explicitly

XSLT transformation to SKOS

<

skos:Concept

rdf:about

="

ivo://ivoa/VOcabulary/AAkeys#magnetohydrodynamicsmhd

">

<

skos:prefLabel

>

Magnetohydrodynamics

(MHD)</

skos:prefLabel

>

<

skos:inScheme rdf:resource="ivo://ivoa/VOcabulary/AAkeys"/> <skos:broader rdf:resource="ivo://ivoa/VOcabulary/AAkeys#physicaldataandprocesses"/> <skos:definition>Magnetohydrodynamics</skos:definition> <skos:altLabel>MHD</skos:altLabel> </skos:Concept>

SKOS EncodingSlide8

Viewing Vocabularies (1)Slide9

Viewing Vocabularies (2)Slide10

Astronomy Exploration Service

Given a term in a vocabulary find

Broader terms

Narrower terms

Related

termsUser should not need to knowMappings between vocabularies

SPARQL

Allow the user to

“explore”

the resultsSlide11

Find all items that are more general than a AOIM variable nova

select ?bURI ?bName

where { AOIM:startypevariablenova rdfs:subClassOf ?r .

?r skos:broader ?bURI .

?bURI skos:prefLabel ?bName .}

Using AAk and AOIM returns:

Retrieving

Broader Terms

?

bURI

?

bName

AOIM:startypevariable

Star: Type: Variable

AAk:stars

StarsSlide12

Semantic Web Navigation (1)

Sealife

project, University of ManchesterSlide13

Semantic Web Navigation (2)

Sealife

project, University of ManchesterSlide14

Semantic Web Navigation (3)

Sealife

project, University of ManchesterSlide15

Future Work

Develop service for seamless astronomical vocabulary

exploration

Explore IR techniques using vocabularies

Generate indexes based on vocabularies

Use vocabularies for query expansionResult ranking based on vocabularies

Develop Terrier module for vocabularies?

Shom More....
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