Difference: TableAccess (12 vs. 13)

Revision 132008-05-15 - DougTody

 
META TOPICPARENT name="IvoaDAL"

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:

serviceDiagram.png

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

TableAccessDiagram.jpg

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:

roadMap.jpg


TAP Focus Groups

TAP/Param

TAP/QL


TAP Working Drafts

TAP/Param

Changed:
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[TAP/Param first draft to be added]
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TAP-V0.2.pdf - TAP draft (includes TAP/Param
Added:
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functionality)
 

TAP/QL

[TAP/QL first draft to be added]


TAP related IVOA Notes


TAP Meetings

TAP planning meeting (JHU November 2007).


-- KeithNoddle - 17 Apr 2008


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