(r6) CharacterisationDataModelRFC < IVOA

IVOA Web>CharacterisationDataModelRFC (revision 6) (raw view)~~EditAttach~~

---++ Characterisation Data Model RFC

This document will act as *RFC* centre for the [[http://www.ivoa.net/Documents/cover/CharacterisationDM-20070530.html][Characterisation Data Model 1.11 Proposed Recommendation]].

Review period:   01 Jun 2007 to 4 Jul 2007

In order to add a comment to the document, please edit this page and add your comment to the list below in the format used for the example (include your TWiki.WikiName so authors can contact you for further information). When the author(s) of the document have considered the comment, they will provide a response after the comment.

Discussion about any of the comments or responses should be conducted on the data model mailing list, dm@ivoa.net.

---++ Comments
---
   * Sample comment (by %MAINWEB%.BrunoRino): ...
      * Response (by _authorname_): ... 
---
   * !CharacterisationAxis class (by %MAINWEB%.FabienChereau):
Hello, instead of having many collections of Properties for each instance of Characterisation (like Resolution, !SamplingPrecision etc..) one for each axis as shown in Figure 4, why don't you have only one collection of a !CharacterisationAxis class which itself would contains the properties for this axis? I think it would make the design clearer. It is also convenient because to each !CharacterisationAxis instance can be associated a single coordinate frame which also apply to each property.
---
   * !Response  (by %MAINWEB%.Mireille.Louys):

   The XML representation of the model has this feature , that is each CharacterisationAxis is a node underwhich we have the properties: coverage, resolution, Sampling for this axis.
For the model we want to keep the symetry , the matrix-like design that is shown in the different examples.
One could search / group the metadata in a Property first order and have , for example Resolution , for all axes, then Coverage, for all axes, etc...
When the axes are not independant, that is Space depends on time, for instance, Resolution may be represented by  a multi-variable function of all axes, and  will be hooked in the Resolution Class.
---



<hr/>

---++ Comments from the Working Group Chairs and Interest Group Chairs

Chairs should add their comments under their name.   

---+++ Mark Allen (Applications WG)

---+++ Christophe Arviset (TCG vice Chair)

---+++ Matthew Graham (Grid &amp; Web Services WG)

---+++ Bob Hanisch (Data Curation &amp; Preservation IG)

---+++ Gerard Lemson (Theory IG)

---+++ Mireille Louys (Data Models WG)

---+++ Keith Noddle (Data Access Layer WG)

---+++ Francois Ochsenbein (VOTable WG)

---+++ Pedro Osuna (VOQL WG)

---+++ Ray Plante (Resource Registry WG)

---+++ Andrea Preite-Martinez (Semantics WG)

---+++ Roy Williams (VOEvent WG)

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Topic revision: r6 - 2007-07-10 - MireilleLouys

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