The 'save as' command in qgis seems to strip out attribute data when creating 
files of certain sorts such as .gpx and also gives problems with .kml where the 
markers are not identified with any of the attributes.  Are there any 
workarounds for these problems?

More detail on the .gpx issue, it will produce a .gpx file if you select 'skip 
attribute creation' but if you don't select this then it fails with the error 
message:
"Export to vector file failed.
Error: creation of field tree_id failed (OGR error: Field of name 'tree_id' is 
not supported in GPX schema. Use GPX_USE_EXTENSIONS creation option to allow 
use of the <extensions> element.)"

It appears to be quite a helpful error message except that I can't see anywhere 
to "Use GPX_USE_EXTENSIONS creation option"

Qgis 1.8 or 1.9 on windowsxp







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