Granted that there is no doc on how supporting new data types. Nonetheless I have some questions:
In what module are double array nodes supported ?
Is there a qSlicerIO for DoubleArrayNodes ?
Is there a MRML logic that reads that kind of files ?
I can't find any csv file in Slicer. No unit test ?

DoubleArray nodes are used by the Charting. But my current interest is to be able to load DoubleArray nodes representing canonical arterial input functions for the PkModeling extension being developed.

All the IO for DoubleArrayNodes is at the MRML level.

There is no qSlicerIO for DoubleArrayNodes. While a DoubleArrayFile enum is present in qSlicerIO, a qSlicerIO for DoubleArrayNodes was not written at the time qSlicerIO was introduced.

There is no MRML logic for these files.

There is a MRMLDoubleArrayNode and a corresponding MRMLDoubleArrayStorageNode.

Can you please include in this issue an example file ?

smalltest.csv attached above is piece of a csv file produced by the MRML storage node and can be read by the MRML storage node.

Fixed in r20804
For information some documentation has been written to help the developers adding new file format supports:
http://www.slicer.org/slicerWiki/index.php/Documentation/4.1/Developers/IO

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