Theo van Veen, Koninklijke Bibliotheek

Theo van Veen, Koninklijke Bibliotheek

Metadata in the context of The European Library

META-LIB workshop Frankfurt 21-22 October 2002

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• Introduction and background• Aspects of the work• The metadata • Overview of architecture• Approach and state of the art review • Analysis of functionality of metadata• TEL metadata registry • Collections• Conclusions

Overview


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• An “accompanying measure” created under auspices of CENL

• Collaboration of national libraries of Finland, Germany, Italy, Netherlands, Portugal, Slovenia, Switzerland, United Kingdom and ICCU and CENL

• Part funded by the European Commission for 30 months to test feasibility

• If successful it is anticipated that other CENL members will participate

Introduction


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• Rich and varied collections and trusted sources of reliable and high quality information

• Unique to each country - enhanced by being united to display the cultural diversity of Europe

• TEL aims to offer a single portal for search and access

The Vision

“.. discovery of and access to the collections, products and services of European National Libraries. ...aimed at users world-wide who want a powerful and easy way of finding European cultural resources. ...will display the richness and diversity of European culture through co-operation in innovation”


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• User perspective– integrated access with central index– multi-lingual subject terms and name authorities– links to local services

• Provider perspective– lower barrier to participate– simple protocols– facilitate conversions and addition of collections

• Library perspective– common vocabulary with ongoing development– machine readable metadata sharing

What TEL is aiming at


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1 Publisher relations

2 Business models

3 Metadata

4 Interoperability testbeds

5 Dissemination and use

6 Management

The work packages


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The metadata jungle

Functionality and serviceswill be our target in the complex metadata world!


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Potential TEL services

• Interlinking national resources• Registry of all European heritage collections• Memory of Europe• Virtual collections (European wide)• Automatic translation of metadata, abstracts

and publications • Timelines and geographical traveling though

heritage collections

Create TEL metadata infrastructure thatmakes it easy toadd new services !


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TEL overviewObject and collection

descriptions Collections and objects

TEL portal

Z39.50

additional services

Link service

s

OpenURL

OAISRU

Central index

DESCRIBING


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Highlights • Combination of distributed searching via Z39.50 and

central indexing using:– The Open Archives Initiative protocol for metadata harvesting

(OAI-PMH) – Search and Retrieve via URLs (SRU)

• Integration with collection level descriptions• Metadata registry for controlled evolution of TEL

application profile• User and context specific link services (OpenURL,URN)• Extra services: multilingual subject service (MACS

project), name authorities service (LEAF project) and authentication


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Search and Retrieve via URLs (SRU)

• Initiative from Z39.50 implementers group• Low barrier implementation of server and client• Search via simple standard URL syntax• Human readable query language (CQL) • XML response conform standard schema in

standard XML envelope • TEL test interface for SRU written as XSL

stylesheet with some additional javascript giving it very powerful portal functionality


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The metadata approach

• State of art review• Use XML and DC-Library Application Profile as

starting point for TEL metadata • Study of functionality: map metadata and

functions• Create TEL application profiles for objects and

for collection descriptions• Create TEL Metadata Registry for profile

maintenance and portal functions• Create a TEL metadata handbook with

guidelines


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TEL realisation

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State of the art review

• No consensus on terminology

• Absence of a common bibliographic format

• Need to share knowledge on metadata standards

• Not yet one standard linking mechanism (URL, URN, PURL, dynamic links)

• Uncertainty on the contents of TEL


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Mapping metadata against functions

• List all metadata elements in DC-Lib

• List (all) possible functions • Check for each combination

whether metadata are usable, needed or not relevant

• Identify metadata elements that are missing or need special attention D

C-L

ib e

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ents

functions


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Functions and services

• search

• record retrieval

• identification

• description

• linking

• multilingual service

• thesaurus service

• collection level

• navigation

• authorisation

• administration

• software requirements

• copy cataloguing

• document ordering

Identification of originalrecord (harvesting, linking by reference)

Metadata for linking by URN and OpenURL

Collection descriptionelements in general

Base-url for dynamic generation of URLsfor direct searching incollections.

Create TEL application profile(s)containing TEL specific metadataelements, but ….


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TEL application profile

• Specification of elements, definitions, rules, and namespaces

• Specifications of characteristics like:– Type of obligation– Vocabularies

• Elements taken from different namespaces: – DCES (Original 15 elements) – Dcterms (approved qualifiers)– DC-LMES (DC Library AP elements) – DC-ED (DC Educational AP elements)– MODS (LC MODS)– Collection Level Description elements– TEL (TEL specific elements)

But .... to enable new functionalityand to retain diversity and richness ....

... we need a mechanism for a controlled evolution of the application profile: the TEL Metadata Registry!


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Purpose of registry• Create TEL application profiles

– for object descriptions– for collection descriptions– for thesaurus records

• Specify behaviour of TEL portal – portal functions and presentation – dynamic link generation– usage of services – search options

• For data providers:– Expose TEL metadata requirements (e.g. conversions)– Offer a menu of existing metadata elements for the proposal

of new elements– Creation of input forms


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TEL Definitions

• The TEL Application Profile contains characteristics on terms agreed by TEL for a specific types of descriptions to:– specify requirements to data providers– exchange information on these terms with the outside

world to improve convergence

• The TEL Metadata Registry is a single place to store data concerning metadata relevant to TEL (including proposed and rejected terms) combined with relevant tools. It is used for : – building application profiles– specify the portal behaviour– maintenance (controlled evolution)


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Shared re-use of registry

XML XSL

output

XSL trans-

formation

TEL metadata registry

Select entries approved for

collection descriptions

TEL collection description profile

Input form / select collection

description entries

Collection description editor

Specification of portal presentation

TEL portal presentation

http://krait.kb.nl/coop/tel/handbook/registry.xml


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Collection description form (D3.3)

Select new field

Elements from TEL application profile for collection level descriptions (based on RSLP)

new

data

fieldExtract namespace prefixes from registry, perform checks, apply rules and generate collection level description in XML according to DCMI guidelines.


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Usage of the registry/profile

registry

TEL portal

Acceptance

procedure

collection

element properties

collection provider

Add element

Specify behavior Meta- data

Application profile

Generate profile(s)

Specify conversions

Check elements

Apply rules

... the TEL metadata registrywill be open for submission only for TEL participants!

The TEL metadata registryshould improve harmonisationof metadata usage, but ...


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Enter new collection

OAI

CLDs

TEL portal

Central index

Acceptance

procedure

Collection description

Meta- data

New collection


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collection

collection

collectioncollectioncollection

objectobject

object object object

Distributed search

Result listObject is target for new search

New result list

Collection hierarchy

Confusing?

But suppose your query matches collections.

Do you want to miss those collections in your result list?

http://krait.kb.nl/coop/tel/portal/teldbs.xml


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Metadata and TEL services

Multi-lingual subject service

Remote target

TEL portal

Central index

Local ink service

Name authority service

Local service

Metadata OpenURL

Local service

Service request

query

Translated subjectImproved

query proposal

Name authorities

query

query

Links to local services

Remote target

metadata

query

Improved query

proposal

http://krait.kb.nl/coop/tel/portal/teldbs.xml


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Conclusions

• Although the current TEL project will not result in a fully operational European Library system, the results of the project will constitute the groundwork on which TEL’s ambitious vision can be realised.

• TEL is is following the newest open standards like Dublin Core in XML, Application Profiles, OAI, SRU and OpenURL.

• “TEL is undertaking pioneering work and should do research, make mistakes, redo and evolve !!!”

More info: http://www.europeanlibrary.org

Theo van Veen, Koninklijke Bibliotheek

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