Setting the "AREA_OR_POINT" Metadata item on GeoTIFFs fails to work

[cmichaelis@…]

Hi there,

If I attempt to set the "AREA_OR_POINT" metadata item for a Geotiff in code, it
seems to work - and I can even use GetMetadataItem() to fetch it back and it is
indeed correct. 

However, it's never written to the file - if I close the file and reopen it, the
metadata item is no longer set.

The line I'm using to set it:
rasterDataset->SetMetadataItem("AREA_OR_POINT", "AREA");

The same thing seems to happen with various capitalizations of either parameter.
It also doesn't seem to take permanent effect if you pass this parameter to the
driver during creation of a new file.

Thanks!
--Chris Michaelis