(r14) TableAccess < IVOA

IVOA Web>IvoaDAL>TableAccess (revision 14) (raw view)~~EditAttach~~

---++ Collaborative Page for the TAP Interface 

The Table Access Protocol (TAP) is a second generation DAL interface being developed to provide a general access mechanism for tabular data, including but not limited to astronomical catalogs. TAP is part of the DAL family of data access interfaces.

---

---+++ Architecture

In general IVOA DAL services obey a simple conceptual model:

<img src="%ATTACHURLPATH%/serviceDiagram.png" alt="serviceDiagram.png"  width="564" height="462"  />

When investigating what a TAP service might provide there are a number of options:

<img src="%ATTACHURLPATH%/TableAccessDiagram.jpg" alt="TableAccessDiagram.jpg"  width="550" height="413"  />

From this can be seen the diveristy of requirements on TAP.

---

---+++ Definition Process

What has become clear (implicit in the lack of progress in the definition of the standard) is that there are many and various requirements on a TAP service from the different VO projects. Broadly these can be categorised as Paramemterised query operations (TAP/Param) and Query Language operations (TAP/QL). Each impose a set of requirements which are hard to reconcil with each other. It is for this reason that the Twin Track approach to TAP definition has been proposed. However, "hard" does not mean "impossible", so the plan is to get the two aspects of TAP defined, the common elements identified and enshrined in both and then to merge the standatrds at V2.

This is shown in the following diagram:

<img src="%ATTACHURLPATH%/roadMap.jpg" alt="roadMap.jpg"  width="350" height="495"  />

---

---+++ TAP Focus Groups

---++++ TAP/Param

   * IVOA.KeithNoddle
   * IVOA.DougTody
   * IVOA.JesusSalgado
   * IVOA.JohnGood
   * IVOA.FrancoisOchsenbein
   * IVOA.MiguelCervino
   * [to be added]

---++++ TAP/QL

   * IVOA.KeithNoddle<br>
   * IVOA.KonaAndrews<br/>
   * IVOA.PedroOsuna<br/>
   * IVOA.AurelienStebe<br>
   * IVOA.InakiOrtiz<br>
   * IVOA.GuyRixon
   * IVOA.PatrickDowler<br/>
   * IVOA.FrancoisOchsenbein<br/>
   * IVOA.GerardLemson<br/>
   * [to be added]


---

---+++ TAP Working Drafts

---++++ TAP/Param

[[%ATTACHURL%/tap-v0.2.pdf][TAP-V0.2.pdf]] - TAP draft (includes
TAP/Param functionality).  This is based upon the discussions from
the tiger team meeting held at JHU last November
([[TapJhu][JHU November 2007]]), as well as follow-on discussions
regarding VOSpace integration, multi-region queries, and other topics.

---++++ TAP/QL

[TAP/QL first draft to be added]

---

---+++ TAP related IVOA Notes

   * [[%ATTACHURL%/TAP-draft.pdf][TAP-draft.pdf]] (__IVOA Note__ Authors: Aurélien Stébé, Kona Andrews, Guy Rixon, Iñaki Ortiz)
   * [[%ATTACHURL%/TAP-Analysis.pdf][TAP-Analysis.pdf]] (__IVOA Note__ Author: D.Tody)

---

---+++ TAP Meetings

TAP planning meeting ([[TapJhu][JHU November 2007]]).

---

-- IVOA.KeithNoddle - 17 Apr 2008


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Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pdf	tap-v0.2.pdf	r1	manage	103.8 K	2008-05-15 - 03:26	DougTody	TAP V0.2 Working Draft (with TAP/Param support)

Topic revision: r14 - 2008-05-15 - DougTody

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