| International Virtual
Observatory Alliance
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IVOA Executive Meeting
23rd June 2004
Glasgow, UK
Registry Workgroup Report
1. Progress to date
Progress since the last exec meeting can pretty much be
summarised in the decisions recorded at the IVOA Interoperability
meeting in Harvard:
General decisions:
- Types are defined in RM
Documents are defined in RI
- Will promote v1.1 of Identifier spec to PR status & thence to REC
- Implement owned/managed authorityID to cater for Publishing/Full registries
Schema decisions:
- Level of hierarchy will be as in RM v1.01
- Switch to type-based schemas (vs subs group)
- Logical-id will be defined via a second relationship (rather than via direct attribute)
- Service types as a sub-class of Resource (rather than extending Capability)
- Organisation type definition will be moved into the base VOResource definitions
- Referred resources will be via ivo-id attribute
- The metadata describing a registry will include a flag indicating whether it is a full or publishing registry.
Interface decisions:
- An IVOA Registry must support OAI-PMH protocol for harvesting via HTTP GET, returning at least oai_dc and ivo_vor metadata formats using standard data criteria
- The IVOA Registry Harvesting protocol will be web service-based and will conform to the full OAI-PMH specification: details will be worked out on the mailing list
- An IVOA Registry must support the Keyword Search as specified in the RI document
- An IVOA Registry must support a Full Query facility (interface tbd) using the WHERE clause of the ADQL schema with field names specified using non-namespaced XPath directives (simple, ie no [...] options), and returning full resource entries
2. Plans
The roadmap for getting to the Jan '2005 demos is:
| Action |
Who |
When |
| Revise schema definition v0.10 | Ray | done |
| Revise RI specification | Kevin | 15-June late: due 25-June |
| Run inter-project harvesting trials | NVO (Ray), AstroGrid (Kevin) | from 01-Aug |
| Implement Keyword query interface | NVO, AstroGrid | from 01-Aug |
| Implement Full query interface | NVO, AstroGrid | from 01-Aug |
| |
| IVOA Interoperability Demo | all projects | Jan 2005 |
We're behind on the RI spec but this could be due to problems that were noticed after the meeting. Kevin and Ray are discussing it now and I've reset the deadline to the end of this week (25th June).
3. Open issues
- How to handle registry entries which have essential details filled in by the registry (by looking up other sources of metadata)
- And 'left-overs' from the meeting:
- Science Resource / Service split
- Application resource description
- SELECT clause in full query
- from Data Model group:
- Data Resource description based on (Catalog) DM
Tony Linde
AstroGrid Project Manager
Chair, IVOA Registry Workgroup