ivoa rm, voresources, identifiers, interfaces chenzhou cui
TRANSCRIPT
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IVOA RM, VOResources, Identifiers, Interfaces
Chenzhou CUI
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AgendaWhy Registry?IVOA Resource Metadata 1.01VOResource 0.10IVOA Identifiers 1.1IVOA Registry Interfaces 1.02
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Semantic Web
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Current WebResources:
identified by URI's untyped
Links: href, src, ... limited, non-descriptive
User: Exciting world - semantics of the resource, however, gleaned from content
Machine: Very little information available - significance of the links only evident from the context around the anchor.
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Semantic WebResources:
Globally Identified by URI's or Locally scoped (Blank) Extensible Relational
Links: Identified by URI's Extensible Relational
User: Even more exciting world, richer user experience
Machine: More processable information is available (Data Web)
Computers and people: Work, learn and exchange knowledge effectively
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Semantic Web一种能让计算机理解的新型 Web 内容形式 "The Semantic Web is an extension of the current web in which information is given well-defined meaning, better enabling computers and people to work in cooperation." -- Tim Berners-Lee, James Hendler, Ora Lassila, The Semantic Web, Scientific American, May 2001
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MetadataMetadata: data for dataDublin Core Metadata
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The role of Resource Registries
Used to discover and locate resources—data and services—that can be used in a VO application
Resource: anything that is describable and identifiable.Besides data and services: organizations, projects, software, …Presently concerned with simple set of resource types
Registry: a list of resource descriptionsExpressed as structured metadata
to enable automated processing and searching
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An Overview of Data Discovery
You can search the main VO registries to find resources based on descriptive criteria
NVO Registries are “coarse-grained”You can find organizations, archives, catalogsWon’t find images, celestial objects, table records
AstroGrid Registries are “fine-grained”Table columns, individual images and associated metadata
Registry framework contains multiple registries:
searchable registriespublishing registries
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Local PublishingRegistry Local
SearchableRegistry
FullSearchableRegistry
Local PublishingRegistry
FullSearchableRegistry
DataCenters
VOProjects
SpecializedPortals & Services
Registry Framework
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Local PublishingRegistry Local
SearchableRegistry
FullSearchableRegistry
Local PublishingRegistry
FullSearchableRegistry
DataCenters
VOProjects
SpecializedPortals & Services
Registry Framework
harvest(pull)
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Local PublishingRegistry Local
SearchableRegistry
FullSearchableRegistry
Local PublishingRegistry
FullSearchableRegistry
DataCenters
VOProjects
SpecializedPortals & Services
Registry Framework
harvest(pull)
replicate
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Local PublishingRegistry Local
SearchableRegistry
FullSearchableRegistry
Local PublishingRegistry
FullSearchableRegistry
DataCenters
VOProjects
SpecializedPortals & Services
Registry Framework
harvest(pull)
replicate
selectiveharvesting
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Local PublishingRegistry Local
SearchableRegistry
FullSearchableRegistry
Local PublishingRegistry
FullSearchableRegistry
DataCenters
VOProjects
SpecializedPortals & Services
ClientApplications
searchqueries
Registry Framework
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Local PublishingRegistry Local
SearchableRegistry
FullSearchableRegistry
Local PublishingRegistry
FullSearchableRegistry
DataCenters
VOProjects
SpecializedPortals & Services
ClientApplications
searchqueries
Registry Framework
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Persistent Archives:Tools for Federation
Registering your resources with a VO publishing registry
Enter description into registration form at one of the available NVO registries:
STScI/JHU Registry: http://nvo.stsci.edu/voregistry/NCSA Registration Portal: http://nvo.ncsa.uiuc.edu/nvoregistration.htmlCaltech Carnivore: http://mercury.cacr.caltech.edu:8080/carnivore/
If you have a large number of resources to register, you can run your own registry on your own site
NCSA VORegistry-in-a-Box http://nvo.ncsa.uiuc.edu/VO/software/Caltech Carnivore: http://mercury.cacr.caltech.edu:8080/carnivore/
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IVOA Identifiers
Two formatsStringXML
Two componentsAuthority IDResource Key
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Registry InterfacesSearch
SearchKeywordSearchGetResigistries
HarvestingIdentifyListIdentifiersListRecordsGetRecordsListMetadataFormatsListSets
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The Registry standard addresses the need for an astronomer to be able to locate, get details of, and make use of, any resource located anywhere in the IVO space, ie in any Virtual Observatory.
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IVOA Registry Definition: The IVOA Registry will allow an astronomer to be able to locate, get details of, and make use of, any resource located anywhere in the IVO space, ie in any Virtual Observatory. The IVOA will define the protocols and standards whereby different registry services are able to interoperate and thereby realise this goal.
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IVOA Resource Registry Specifications
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OAI linksOpen Archives Initiative Protocol for Metadata Harvesting (2.0)OAI - Repository Explorer(检测接口与OAI的兼容性)OAI Tools Registry Interface , HarvestingIssues