1. Metadata Registries Registry: authoritative, centrally controlled store of information – W3C Web Services Glossary, 2004 http://www.w3.org/TR/ws-gloss/

2. Primary functions  Registering  Publishing  Managing  Data Storage  User Services via a Web Interface  Navigation  Searching  Browsing –M2M Services Querying Using an API to programmatically create, view, and modify contents –Crosslinking –Crosswalking –Schema translation And many more … …

3. 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

4. Metadata Registries = registering metadata schemas

5. 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

6. Examples:  Cross-domain and cross-schema registries,  e.g., UKOLN’s SCHEMAS Registry  CORES Registry http://cores.dsd.sztaki.hu/ http://cores.dsd.sztaki.hu/  JISC IE Metadata Schema Registry (IEMSR) project JISC IE Metadata Schema Registry (IEMSR)  Domain-specific, cross-schema registries,  e.g., UKOLN’s MEG (Metadata for Education Group) RegistryMEG (Metadata for Education Group) Registry  Australian Institute of Health and Welfare - Metadata Online Registry (METeOR) 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

7. http://www.cores-eu.net/registry/ http://cores.dsd.sztaki.hu/

8. Registry Practice 1  Go to Cores Registry: http://cores.dsd.sztaki.hu/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?

9. Metadata Registries that Include Schemas and related Encoding Schemes

10. DCMI Open Metadata Registry http://dcmi.kc.tsukuba.ac.jp/dcregistry/navigateServlet

12. Open Metadata Registry http://metadataregistry.org/Element Sets http://metadataregistry.org/schema/list.html

13. http://metadataregistry.org/ Value Vocabularies Concepts in a value vocabulary

14. Registry Practice 2  Go to DCMI Registry at: http://dcmi.kc.tsukuba.ac.jp/dcregistry/navigateSer vlet http://dcmi.kc.tsukuba.ac.jp/dcregistry/navigateSer vlet  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?

15. 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 & Meta Science Data & Systems Where & When MediaMarket Library City

16. Vocabularies included And a lot more …

17. About a vocabulary: Basic information; Relationship with others

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