How to prevent Element-Attributes in Framemaker 12 MIF-files from translation

Hello Everybody

I'm looking for a solution how to prevent Element-Attributes in Framemaker 12 MIF-files from translation.

The MIF files I have to deal with contain some Element-Attributes which must not be translated but are offered for translation by Trados Studio. I'd expected there would be an option in Studio's MIF filter, but I can't identify one.

The Element-Attributes are also in the analysis so that we have more than 90.000 words, but we expected to not more than 30.000.

Thanks in advance