一种能让计算机理解的新型Web内容形式

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,IVOA RM,VOResources,Identifiers,Interfaces,Chenzhou,CUI,Agenda,Why Registry?,IVOA Resource Metadata 1.01,VOResource,0.10,IVOA Identifiers 1.1,IVOA Registry Interfaces 1.02,Semantic Web,Current Web,Resources:,identified by URIs,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.,Semantic Web,Resources:,Globally Identified by URIs,or Locally scoped(Blank),Extensible,Relational,Links:,Identified by URIs,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,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,Metadata,Metadata:data for data,Dublin Core Metadata,The role of Resource Registries,Used to discover and locate,resources,data and servicesthat 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 descriptions,Expressed as structured metadata,to enable automated processing and searching,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,catalogs,Wont find images,celestial objects,table records,AstroGrid Registries are“fine-grained”,Table columns,individual images and associated metadata,Registry framework contains multiple registries:,searchable,registries,publishing,registries,Local,Publishing,Registry,Local,Searchable,Registry,Full,Searchable,Registry,Local,Publishing,Registry,Full,Searchable,Registry,Data,Centers,VO,Projects,Specialized,Portals&Services,Registry Framework,Local,Publishing,Registry,Local,Searchable,Registry,Full,Searchable,Registry,Local,Publishing,Registry,Full,Searchable,Registry,Data,Centers,VO,Projects,Specialized,Portals&Services,Registry Framework,harvest,(pull),Local,Publishing,Registry,Local,Searchable,Registry,Full,Searchable,Registry,Local,Publishing,Registry,Full,Searchable,Registry,Data,Centers,VO,Projects,Specialized,Portals&Services,Registry Framework,harvest,(pull),replicate,Local,Publishing,Registry,Local,Searchable,Registry,Full,Searchable,Registry,Local,Publishing,Registry,Full,Searchable,Registry,Data,Centers,VO,Projects,Specialized,Portals&Services,Registry Framework,harvest,(pull),replicate,selective,harvesting,Local,Publishing,Registry,Local,Searchable,Registry,Full,Searchable,Registry,Local,Publishing,Registry,Full,Searchable,Registry,Data,Centers,VO,Projects,Specialized,Portals&Services,Client,Applications,search,queries,Registry Framework,Local,Publishing,Registry,Local,Searchable,Registry,Full,Searchable,Registry,Local,Publishing,Registry,Full,Searchable,Registry,Data,Centers,VO,Projects,Specialized,Portals&Services,Client,Applications,search,queries,Registry Framework,Overview of Publishing,Resources are,published,if one can use VO facilities to find them.,Multiple layers of publishing,Starts with registry description of resource,Data Access Services,Incremental exposure for incremental effort,Who are you?,How you publish depends on what you want to publish.,An individual with a small data collection,An archive center,Someone with a cool service,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.html,Caltech 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/,What can/should you register?,Should:your Organization,Declares yourself as a publisher with an ID,Should:your Collection,Can:your existing services,Browser-based services:,e.g.search page,Traditional CGI services,Web Services,The next level,Implement and register one or more standard services,Cone Search,Simple Image Access,SkyNode*,Simple Spectral Access*,*standard still in development,Persistent Archives:Tools for Federation,Resource Metadata:XML Schema,Classes of Resources,Organisation,DataCollection,Service,Registry,Specific classes inherit from generic,Organized into separate schemas:,Core resource metadata:VOReso