Metadata RegistriesMetadata Registries

Registry: authoritative, centrally controlled store of information

– W3C Web Services Glossary, 2004http://www.w3.org/TR/ws-gloss/

Primary functions

RegisteringPublishingManaging

Data StorageUser Services via a Web

InterfaceNavigationSearching Browsing

– M2M Services• Querying• Using an API to

programmatically create, view, and modify contents

– Crosslinking– Crosswalking– Schema translation

And many more … …

Registry Types – Perspective 1

“Data Registries”= data standards

“Metadata Registries”

= metadata schemas

Terminology Registries /Services

= Knowledge Organization Systems (KOS)= encoding schemes= code sets= valid/permissible value lists

Service Registries

Metadata RegistriesMetadata Registries

= registering = registering metadata schemasmetadata schemas

Metadata Registries

• Purpose: – to collect data related to metadata schemas

• Functions:– to store data elements

• include both semantics and representations

– to provide the means • to identify and refer to established schemas and

application profiles• to crosswalk and map among different schemas

Examples:

Cross-domain and cross-schema registries, e.g., UKOLN’s SCHEMAS Registry CORES Registry

http://cores.dsd.sztaki.hu/ JISC IE Metadata Schema Registry (IEMSR) project

Domain-specific, cross-schema registries, e.g., UKOLN’s MEG (Metadata for Education Group) Registry Australian Institute of Health and Welfare - Metadata Online

Registry (METeOR)

Project-specific registries, e.g. The European Library (TEL) metadata registry,

whose purpose is recording all metadata activities associated with TEL

Standard-specific registries e.g., DCMI Metadata Registry

Metadata Registries

http://www.cores-eu.net/registry/http://www.cores-eu.net/registry/

http://cores.dsd.sztaki.hu/

Registry Practice 1 Go to Cores Registry: http://cores.dsd.sztaki.hu/ Explore:

Is a full MODS element set registered?What elements from MODS are registered? By

whom?What elements are in the British Library Application

Profile? Is there any application profile available for

postcards?Is there an element ‘measurement’ in the registry?

Metadata Registries Metadata Registries that Includethat IncludeSchemas Schemas

and relatedand related Encoding SchemesEncoding Schemes

DCMI Open Metadata Registry

http://dcmi.kc.tsukuba.ac.jp/dcregistry/navigateServlet

http://dcmi.kc.tsukuba.ac.jp/dcregistry/navigateServlet

Open Metadata Registryhttp://metadataregistry.org/Element Sets

http://metadataregistry.org/schema/list.html

http://metadataregistry.org/

Value Vocabularies

Concepts in a value vocabulary

Registry Practice 2Go to DCMI Registry at:

http://dcmi.kc.tsukuba.ac.jp/dcregistry/navigateServlet

Choose your “Language Preference”View ‘properties’ and explain why there are two

‘contributors’ in the registry.Where is “hasVersion” defined? What is the

namespace URI? What property does it refine?What ‘encoding schemes’ have been registered

there?What is “IMT”? Can you find the value for jpeg

2000?

http://lov.okfn.org/dataset/lov/index.html

The LOV dataset contains the description of RDFS vocabularies or OWL ontologies defined for and used by datasets in the Linked Data Cloud.

Upper & MetaScienceData & Systems

Where & When

Media Market

LibraryCity

Vocabularies included

And a lot more …

About a vocabulary: Basic information;Relationship with others

Including many ontologies, e.g., Music Ontology (MO)