VO Registry & China VO DAS

VO Registry & China VO DAS

路勇

中国虚拟天文台研发团队

Chinese Virtual Observatory

11/29-12/03China-VO 2006, Guilin 2

Index

•VO Registry

•DAS and Registry

•Get Image and Spectral by ADQL

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VO Registry

•Registry: A repository of structured descriptions of resources

•Expressed as structured metadata

•Resource: Anything can be a Resource

•Unique Identifier

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VO Registry

The IVOA Registry allow astronomers to be able to locate, get details of, and make use of, any resource located anywhere in the IVO space, i.e. 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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VO Registry

Searchable registry

Publishing registry

Full registry

Local registry

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VO Registry

Searchable Registry : allows users and client applications to search for resource records using selection criteria against the metadata contained in the records.

Publishing Registry : simply exposes its resource descriptions to the VO environment in a way that allows those descriptions to be harvested.

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VO Registry

•Full registry: attempts to contain records of all resources known to the VO.

•Local Registry: contains only a subset of known resources.

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Local PublishingRegistry Local

SearchableRegistry

FullSearchableRegistry

Local PublishingRegistry


DataCenters

VOProjects

SpecializedPortals & Services

Registry Framework

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SearchableRegistry




DataCenters

VOProjects


Registry Framework

harvest(pull)

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SearchableRegistry




DataCenters

VOProjects


Registry Framework

harvest(pull)

replicate

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SearchableRegistry




DataCenters

VOProjects


Registry Framework

harvest (pull)

replicate

selectiveharvesting

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SearchableRegistry




DataCenters

VOProjects


ClientApplications

searchqueries

Registry Framework

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SearchableRegistry




DataCenters

VOProjects


ClientApplications

searchqueries

Registry Framework

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VO Registry

•Resources and Services can be searched for based on their characteristics

•Query results returned in machine-interpretable form

•It should be possible to uniquely retrieve a description of a resource or service either via a unique ID or via a small and predictable set of metadata.

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VO Registry

•Be easy for data/service provider to register a new service.

•Be easy or automatic to update the metadata associated with a resource or service.

•Be easy to unregister a resource and service

•The registry should expect that registered services may become temporarily unavailable.

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Registering your Resource

•First, just enter the description into registration form at one of the available 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/

http://nvo.stsci.edu/voregistry/



http://nvo.ncsa.uiuc.edu/nvoregistration.html

http://nvo.ncsa.uiuc.edu/nvoregistration.html

http://mercury.cacr.caltech.edu:8080/carnivore/

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Registering your Resource

•Secondly, 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/

http://nvo.ncsa.uiuc.edu/VO/software/



http://mercury.cacr.caltech.edu:8080/carnivore/

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Registry Interface

•Defining a standard query and harvesting interface.

•This will allow the communication between registries to be a standard, and allow external implementations that need access to a registry a standard for querying the Registry.

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Using Registry to get Data Resource

通过 Registry 获得 Data Resource 信息：1查询 Registry

2解析查询结果3生成 Metadata 对象4填充 DataResourceMap

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration

MDItemGeneralContent

MDItemService

MDItemCollection

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration


MDItemService

MDTable

MDItemCollection

name

MDFiled

description

name

ucd

unit

description

datatype

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration


MDItemService

MDItemCollection

MDItemResolution

MDItemCoverage

Facility

Instrument

Formats, etc

Spectral, Spectral

Region of Regards, Bandpass, etc

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration


MDItemService

MDItemCollection

DataQuality

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration


MDItemService

MDItemCollection

Title

Shortname

Identifer

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration


MDItemService

MDItemCollection

Publisher

PublisherID

Creator

Date

ContactName

ContactEmail

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration


MDItemService

MDItemCollection

Subject

Description

ReferenceURL

Type

Source, etc

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Metadata

MDDataResource

MDItemDataQuality

MDItemIdentity

MDItemCuration


MDItemService

MDItemCollection

MDItemServiceInterface

MDItemServiceCapibility

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Resource Metadata: XML Schema

<?xml version="1.0" encoding="utf-8"?><ArrayOfDBResource xmlns:xsd="http://www.w3.org/2001/XMLSchema"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.us-vo.org">

<DBResource xsi:type="ServiceSkyNode"><dbid>5963</dbid><status>1</status><Identifier>ivo://archive.stsci.edu/galex/SKYNODE</Identifier><Title>Galaxy Evolution Explorer</Title><ShortName>GALEX</ShortName><CurationPublisherName>STScI</CurationPublisherName><CurationCreatorName>Alberto Conti</CurationCreatorName>…………………………

<PrimaryTable>Photoprimary</PrimaryTable><PrimaryKey>objid</PrimaryKey>

</DBResource>

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Resource Metadata: XML Schema

<?xml version="1.0" encoding="utf-8"?><ArrayOfDBResource xmlns:xsd="http://www.w3.org/2001/XMLSchema"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.us-vo.org">

<DBResource xsi:type="ServiceSkyNode"><dbid>5963</dbid><status>1</status><Identifier>ivo://archive.stsci.edu/galex/SKYNODE</Identifier><Title>Galaxy Evolution Explorer</Title><ShortName>GALEX</ShortName><CurationPublisherName>STScI</CurationPublisherName><CurationCreatorName>Alberto Conti</CurationCreatorName>…………………………

<PrimaryTable>Photoprimary</PrimaryTable><PrimaryKey>objid</PrimaryKey>

</DBResource>

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VO Registry & VO Table

<?xml version="1.0"?><VOTABLE version="1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="http://www.ivoa.net/xml/VOTable/VOTable/v1.1"><COOSYS ID="J2000" equinox="J2000." epoch="J2000." system="eq_FK5"/><RESOURCE name="BADCDAITEST">

<TABLE name="sdss"><DESCRIPTION>Velocities and Distance estimations</DESCRIPTION><FIELD name="ra" ID="col1" ucd="pos.eq.ra;meta.main" ref="J2000"

datatype="float" width="6" precision="2" unit="deg"/><FIELD name="decl" ID="col2" ucd="pos.eq.dec;meta.main" ref="J2000"

datatype="float" width="6" precision="2" unit="deg"/></TABLE>

</RESOURCE></VOTABLE>

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Get Image by ADQL

•用户提交 ADQL 查询语句•解析 ADQL

•如果涉及到 Image 查询， OGSA DAI 中的 activity 查询虚拟的“图像数据库”。

•查询的结果按照用户的需求放在指定的URL

Documents

VO Registry & China VO DAS