Hi Micha,

I can only suggest you a way outside of darktable but perhaps it helps:
at the moment I use exiftool [1] to achieve pretty much the same than
you. I have a white list of tags I want to keep. For example I like
keeping the original date and time of the image. I use the following
command to change all images in the current directory:

|exiftool -r -all= -tagsFromFile @ -AFMode -ApertureValue -Artist
-BrightnessValue -CanonExposureMode -MakerNotes:CanonFlashMode
-ColorSpace -ColorTone -Contrast -DateTimeOriginal -DigitalZoomRatio
-ExifVersion -ExposureBiasValue -ExposureCompensation -ExposureMode
-ExposureProgram -ExposureTime -FlashActivity -FlashBits -Flash
-FlashEnergy -FlashOutput -FNumber -FocalLength -FocusMode -GainControl
-HighISONoiseReduction -HighlightTonePriority -ISO -ISOSetting
-ISOSpeedRatings -LensType -LongExposureNoiseReduction -Macro -Make
-MaxApertureValue -MakerNotes:MeteringMode -MinAperture -MirrorLockup
-Model -Orientation -Quality -Saturation -SceneCaptureType -Sharpness
-ShutterSpeedValue -SpatialFrequencyResponse -SubsecTimeOriginal
-WhiteBalance ./|

I got this from a German blog [2]. I just found an English one
explaining the same, with an interesting hint at the end how to find the
right tag names:
http://fleckenzwerg2000.blogspot.de/2011/07/exiftool-for-my-privacy.html

Best regards,
Benjamin

[1] https://en.wikipedia.org/wiki/ExifTool and
http://www.sno.phy.queensu.ca/~phil/exiftool/
[2]
http://www.georglutz.de/blog/2009/12/23/exif-daten-von-eigenen-aufnahmen-mit-exiftool-saubern/

Am 15.07.2013 01:33, schrieb Micha Pietsch:
> Hi guys,
>
> metadata and tagging have already been discussed today.
>
> I use tagging for workflow management (bw, final, portrait format or 
> not) but I'll use color markers in the future. They can be used in 
> collection filters.
>
> But I also use star rating for priority categories.
>
> I want to export images without workflow tags (see above, no tags 
> anymore), rating (persons might draw wrong conclusions) and EXIF 
> (embedded preview images might reveal details I intent not to publish).
>
> Is there a possibility to tell dt to export without metadata?
>
> -- Micha
>
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