一种能让计算机理解的新型Web内容形式

Local Searchable Registry
Specialized Portals & Services
Registry Framework
harvest
(pull)
Full Searchable Registry
VO Projects replicate
Local Publishing Registry
Full Searchable Registry
Data Centers
Local Publishing Registry
selective harvesting
Local Searchable Registry
Specialized Portals & Services
Registry Framework
VO Projects
Local Publishing Registry
Full Searchable Registry
Data Centers
Local Publishing Registry
Local Searchable Registry
Specialized Portals & Services
You can find organizations, archives, catalogs Won’t find images, celestial objects, table records
AstroGrid Registries are “fine-grained”
Table columns, individual images and associated metadata
Semantic Web
Current Web
Resources: 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.
Even more exciting world, richer user experience
Machine:
More processable information is available (Data Web)
Computers and people:
Work, learn and exchange knowledge effectively
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
Full Searchable Registry
Data Centers
Local Publishing Registry
Local Searchable Registry
Specialized Portals & Services
Registry Framework
harvest
(pull)
Full Searchable Registry
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.
Data Centers
Local Publishing Registry
search queries
Local Searchable Registry
Client Applications
Specialized Portals & Services
Persistent Archives:Tools for Federation
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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Registry framework contains multiple registries:
searchable registries publishing registries
Registry Framework
Full Searchable Registry
VO Projects
Local Publishing Registry
Semantic Web
Resources:
Globally Identified by URI's or Locally scoped (Blank) Extensible Relational
Links:
Identified by URI's Extensible Relational
User:
Registering your resources with a VO publishing registry
Enter description into registration form at one of the available NVO registries:
STScI/JHU Registry: /voregistry/ NCSA Registration Portal: /nvoregistration.html Caltech Carnivore: :8080/carnivore/
Besides data and services: organizations, projects, software, … Presently concerned with simple set of resource types
Registry: a list of resource descriptions
IVOA Resource Registry Specifications
OAI links
Open 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
IVOA Identifiers
Two formats
String XML
Two components
Authority ID Resource Key
Registry Interfaces
Search
Search KeywordSearch GetResigistries
Harvesting
Identify ListIdentifiers ListRecords GetRecords ListMetadataFormats ListSets
Metadata
Metadata: data for data Dublin Core Metadata
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.
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 /VO/software/ Caltech Carnivore: :8080/carnivore/
Registry Framework
harvest
(pull)
Full Searchable Registry
VO Projects replicate