[gdal-dev] Number of fields when creating layer?

[Abel Pau]

Hi everybody,
do anyone know if a driver can know the number of fields (and it's names, etc) of a layer BEFORE starting fetch features? So in the moment of create the layer.
I mean, when a driver is creating the own layer it could probably be interested in creating all fields before starting and not in the middle of translation. It could be caused because the output format requires that in terms of efficiency.

For instance, first feature have 3 fields, second feature have four, etc... Until the last feature driver is not sure of all fields are definitive.
And every time a feature is added the driver have to verify in which destination field corresponds to the new one.

So, I accepted that it happens with the number of features (Even can remember my concerns that time) and I am wondering if I have to accept that for the number of fields.

Thanks a lot.



Abel Pau Garcia
GIS developer
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