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Topicbased approaches to searching

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The ongoing need for controlled vocabularies and authority control ... Dictionary of National Biography. Dictionary of Australian Artists Online ... – PowerPoint PPT presentation

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Title: Topicbased approaches to searching

1
Topic-based approaches to searching
Judith Pearce and Basil Dewhurst National Library
of Australia
2
What Ill cover

The ongoing need for controlled vocabularies and
authority control
How they are currently being deployed in resource
discovery
Doing more with authority files through a
topic-based approach to searching
People Australia as exemplar

3
Assertion

Findability is improved through the use of
controlled vocabularies

4
Why

A single word may have multiple meanings
Different words may mean the same thing
A concept may be a subset of a broader concept or
related to another concept
People may have many names
The same name may be used by different people

5
Types of controlled vocabularies

Simple enumerated lists
Taxonomies
Synonym rings
Thesauri
Rules-based

6
IFLA conceptual models

Functional Requirements for Bibliographic Records
(FRBR)
Functional Requirements for Authority Data (FRAD)
Functional Requirements for Subject Authority
Records (FRSAR)

7
Bibliographic entities
Person
Concept
Work
Family
Object
Expression
Event
Manifestation
Corporate body
Place
Item
Names
Identifiers
Controlled access point
8
International thesaurus standards

ISO 27881985 Guidelines for the establishment
and development of monolingual thesauri (BS5723
1987)
ISO 5964 1985 Guidelines for the establishment
and development of multilingual thesauri (BS
6723 1985)

9
New work item proposal

Revise the two ISO standards based on BS
87232005 Structured vocabularies for information
retrieval
Definitions, symbols and abbreviations
Thesauri
Vocabularies other than thesauri
Interoperability between vocabularies
Exchange formats and protocols for
interoperability

10
Other work

ANSI/NISO Z39.19 2003 Guidelines for the
Construction, Format, and Management of
Monolingual Thesauri
Freely available
Single part
Readable
Addresses interoperability issues
Touches on multilingual issues

11
Schemas

Authority data
International Standard Archival Authority Record
for Corporate Bodies, Persons, and Families
(ISAAR)
MARC format for authority data
Metadata Authority Description Schema (MADS)

Thesauri
Z39.50 ZTHES
Simple Knowledge Organisation System (SKOS)
Parties
Encoded Archival Context (EAC)
DC Agents
International Standard Name Identifier (ISNI)

12
Deployment (traditional)

Keyword searching
part of resource description
Limits and filters
Coded values not directly searchable
Fielded searching
two-step process to exploit non-preferred forms
Subject hierarchies
Authority files
Mainly a librarians tool
Need for user training and intermediation

13
Deployment (new generation)

Google-like search
Relevance ranking
Faceted clustering
Form (books, pictures, maps)
Names
Subjects
Dates
Audience

14
Outstanding issues

What the user keys in may not match controlled
access points
Limitations of faceted clustering
How many topics to display
Selecting a facet limits the search
Increases precision but not recall
Topic attributes not exploited in the simple
keyword search

15
Topic-based searching
16
Another way of looking at FRBR
Topic
Resource
Party
Work
Concept
Expression
Event
Manifestation
Place
Item / Object
Resource
17
People Australia

An online service that
Takes a topic based approach to resource
discovery
Provides access to records about people and
organisations
Allows users to find and get resources, by/about
a person or organisation
Interoperates with contributors services

18
Precursors

Bright Sparcs
Australian Womens Archive Project
Australian Trade Union Archive
Dictionary of National Biography
Dictionary of Australian Artists Online
Archive manuscript collections
Australia Dancing
Music Australia

19
Content

Australian Name Authority File
200,000 Australian names
Some contextual information
Contributor data
24 archives, museums and libraries
Over 47 services
Rich sources of information
Resources by or about Australian people in
Australian collections

20
Architecture

Harvesting contribution model
Records clustered under a single identifier
Harvested records fully searchable
Hub or lens pages for each person
Links to information by or about the person
Deep linking to contributor services
Both people and organisations

21
Example

Sir Douglas Mawson was a geologist and explorer
famous for leading the Australasian Antarctic
Expedition 1911 1914
A People Australia page for Mawson would provide
Biographical information from contributor records
Bibliographic records from Libraries Australia
Image records from Picture Australia
Newspaper articles from the new Newspapers
Discovery Service
Related scholarship from the ARROW Discovery
Service
Museum objects
Archival resources

22
Data Schema