[GRASS-user] GRASS vector in a vrt file ?

[gene]

Hello,
Is it possible to use Grass  6.4 vector in a vrt file ?
I try 
<OGRVRTDataSource>
<OGRVRTLayer name="sond">
<SrcDataSource>/home/grassdata/geol/test/vector/sond/head</SrcDataSource>
<SrcLayer>1</SrcLayer>
</OGRVRTLayer>
<OGRVRTDataSource>

following  the specifications of  http://www.gdal.org/ogr/drv_grass.html
http://www.gdal.org/ogr/drv_grass.html  for the Datasource name and the
example of 
http://lists.gispython.org/pipermail/community/2006-February/000184.html
http://lists.gispython.org/pipermail/community/2006-February/000184.html  :
<OGRVRTDataSource>
<OGRVRTLayer name="wil">
<SrcDataSource
relativeToVRT="0">/path/to/grassdata/location/mapset/vector/wil/
head</SrcDataSource>
<SrcLayer>1</SrcLayer>
</OGRVRTLayer>
> OGRVRTDataSource>

without success. (with SrcLayer = 0 or 1, with or without relativeToVRT="0")

Thanks

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