Chair: Doug Tody [DT]

Minutes: Markus Dolensky [MD]

There were about 40 participants.

Overview of DAL types of data, DT

SIA V1.1; key issues, DT

• dataset IDs
• component data models
• access reference templating

Q: How to deal with uniquness of a dataset identifier?
A: Within authority ID domain data IDs assigned by each authority. One 'can' state that a ID is a replica, but this is not ensured.

Q: How to state data quality?
A1: Part of data model and characterization of data.
A2: Resource metadata allows have basic quality description of data collection.

Q: What about IDs of OTF processed products?
A: Goes to deeper question of what does it mean to publish data to the VO?
IDs do not change, but data may go away.

Proposed evolutions for SIA, Francois Bonnarel

• URL templates to get less verbose output
• factorization of repetitive cell values
• data model serialization
• Question: Would XSLT or Xpath be the right way to implement URL template resolution?
• Francois asks for feedback to be sent to dal@ivoa.net

SSA Overview, DT

• A survey among data providers and consumers has been conducted.

SED Intro, MD

• This lead to a discussion about properties and query parameters that SSA services should recognize and support. See presentation (.pdf, .ppt)
• Some missing bits were identified:
  • definition how to group parameter blocks; i.e. chunks of points with common meta info
  • reference frame (e.g. velocity frame, rest frame)

Spectral Data Model, Jonathan McDowell

• follow above link for intro to modeling effort
• Suggestion: Use term "samples"
• Note that model also is supposed to cover SEDs

SSA Issues (discussion)

• add query parameter for spectral resolution
• Suggestion: Find more use cases
• About formats: VOtable, text, fits binary table or image, graphics

Q: Conversion support for units needed?
A: No.