(r2) InterOpOct2003DAL < IVOA

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*Data Access Layer Working Group sessions Oct 16-17, 2003 at InterOpOct2003*

Chair: Doug Tody [DT]

Minutes: Markus Dolensky [MD]

There were about 40 participants.

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Content:

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---++ 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?<br>
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?<br>
A1: Part of data model and characterization of data.<br>
A2: Resource metadata allows have basic quality description of data collection.

Q: What about IDs of OTF processed products?<br>
A: Goes to deeper question of what does it mean to publish data to the VO?<br>
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 [[SsaSurvey][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 ([[%PUBURL%/%WEB%/IvoaDAL/dalsedspec.pdf][.pdf]], [[%PUBURL%/%WEB%/IvoaDAL/dalsedspec.ppt][.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)

---++ [[http://www.ivoa.net/forum/dm/0132.htm][Spectral Data Model]], Jonathan <nop>McDowell</nop>
   * follow above [[http://www.ivoa.net/forum/dm/0132.htm][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? <br>
A: No.



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Topic revision: r2 - 2003-10-18 - TWikiGuest

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