1. Union Catalog and Knowledge
Engineering for TELDAP
Keh-Jiann Chen
Principal Investigator
Core Platforms for Digital Contents Project, TELDAP
Research Fellow
Research Center for Information Technology Innovation &
Institute of Information Science, Academia Sinica

2.  Outline
 Introduction
 Union catalog
 Databases and metadata for
digital contents and websites
 Knowledge engineering
 Future perspective

3.  Introduction
The integration and management of digital
contents has become an important issue as
the amount of digital contents produced from
different projects and institutions increases
rapidly.
The goal of our project is to achieve
optimized preservation, retrieval, and
presentation of digital collections.

4.  Outline
 Introduction
 Union catalog
 Databases and metadata for
digital contents and websites
 Knowledge engineering
 Future perspective

5. What is the union catalog ？
• It is a catalog and portal for all digital collections of
TELDAP.
• It is an integrated platform for browsing and searching
entire digital contents of TELDAP.
• Metadata provides core descriptions and licensing
information of each digital collection.

6. Browsing by topics
Search by keywords
Home Page of Union Catalog

7.  Outline
 Introduction
 Union catalog
 Databases and metadata for
digital contents and websites
 Knowledge engineering
 Future perspective

8.  Metadata models for different
types of objects
Archived digital items
• Union catalog metadata model- Dublin core+
Web sites
• DCCAP (Dublin Core Collections Application Profile)
• Fields for internal used only
― Unique Identifier, Format, Evaluation, Cataloging History
Documents
• Document metadata-Dublin core

9. 9
Metadata for
digital items ：
Over 3 million
digital items and
still increasing
Element Definition
Title A name given to the resource
Creator An entity primarily responsible for making the
content of the resource
Subject and Keywords The topic of the content of the resource
Description An account of the content of the resource
Publisher An entity responsible for making the resource
available
Contributor An entity responsible for making contributions to the
content of the resource
Date A date associated with an event in the life cycle of
the resource
Resource Type The nature or genre of the content of the resource
Format The physical or digital manifestation of the resource
Resource Identifier An unambiguous reference to the resource within a
given context
Source A Reference to a resource from which the present
resource is derived
Language A language of the intellectual content of the
resource
Relation A reference to a related resource
Coverage The extent or scope of the content of the resource
Rights Management Information about rights held in and over the
resource

10. 10

11. Metadata for websites
Over 500 websites and still increasing
Metadata
• DCCAP (Dublin Core Collections Application
Profile)
• Total of 19 data fields

12. The Website Homepage Picture
URL, Project Information
Type, Name, Author, Subject,
Description, Language,
Item Type, Target
Archived Information:
URL, time, authorization
Copyright, Purpose, Other Information
Figure: http://digitalarchives.tw
Metadata for
websites

13. Dynamic categorization
• User-oriented categorization
– General, elementary school students, high school
students, researchers, …etc.
• Topical-based categorization
– Archaeology, painting, animal, plant, document, …
etc.
• Functional-based categorization
– Research, education, business, technology,…
• Categorization based on institutions
– Academia Sinica, Taiwan U., Palace museum,…

14. Purpose: Education
Target: Elementary school student,
Junior high school student,
Teacher…
Purpose: Creative applications
Purpose: Academic research
Subject: Animal, Archaeology,
Anthropology…
Figure: http://digitalarchives.tw
Digitalarchives.tw

15. Metadata for project documents
Over 14,000 documents and still increasing
Metadata- Dublin core
Construct Teldapwiki- A Wikipedia for
TELDAP http://wiki.teldap.tw/

16.  Outline
 Introduction
 Union catalog
 Databases and metadata for
digital contents and websites
 Knowledge engineering
 Future perspective

17. Plans of making knowledge
structures for TELDAP
• Construct metadata models for different objects.
• Establish hyperlinks between contexts and
objects.
– Develop keyword extraction tools.
– Design automatic hyperlink tagging tools.
• Construct TELDAP ontology and thesaurus.
– Art & Architecture Thesaurus by Getty
– Chinese WordNet

18. (1) Metadata models for different objects
• Digital collections
– Union catalog metadata model- Dublin core+
• Web sites
– DCCAP (Dublin Core Collections Application Profile)
– Public fields
– Private fields
 Unique Identifier, Format, Evaluation, Cataloging History
• Documents
– Document metadata-Dublin core

19. (2) Establish hyperlinks between contents
and objects
• Identify keywords in contents.
• Tag keywords with related object hyperlinks.

20. Develop hyperlink tagging tools
• Word segmentation tools
– Resolve word segmentation ambiguities and identify
keywords.
– CKIP word segmentation system:
http://ckipsvr.iis.sinica.edu.tw/

21. Develop hyperlink tagging tools
• TELDAP keyword dictionary
– Extract keywords from metadata and establish
object-keyword relations.
 Extract text from XML data for each object.
 The text are classified by topics, titles,
descriptions, authors, locations, eras etc.
 From each class of text file extract keywords by
automatic word segmentation, keyword
extraction, and manual post editing.
– Current dictionary contains more than 50,000
Keywords.

22. Prototype system for hyperlink tagger
• Identify and select keywords from the input text

23. Prototype system for hyperlink tagger
• Produce text with keywords and hyperlinks

24. Prototype system for hyperlink tagger
• Hyperlinks point to the related digital collections

25. (3) Construct TELDAP ontology and
thesaurus
Establish association links between
Chinese keywords and Getty AAT.
Merge TELDAP keywords with Chinese
AAT.

26.  Outline
 Introduction
 Union catalog
 Databases and metadata for
digital contents and websites
 Knowledge engineering
 Future perspective

27.  Future Perspective
• Technology development
– Construct multi-lingua thesauri – extend Getty AAT.
– Maintain the TELDAP keyword-and-object relation
database.
– Construct name authority files, gazetteers, and
universal calendars.
– Design hyperlink taggers and keyword extension tools.
– Design an authoring tool which provides hyperlinks of
keyword related digital contents automatically.
– Design knowledge-based content retrieval system.

28.  Future Perspectives
• Content enrichment
– Within TELDAP ：
 Standardize object metadata model and data format.
 Provide object metadata in controlled vocabulary.
 Write scripts and stories for different topics with Wiki-like
knowledge structure.
 Enrich the digital collections.
 Establish hyperlinks between text books and TELDAP
collections.
– Extend the knowledge sources ： e.g. Wikipedia