Xara wizardry to create transparency?

[Lexje]

Hi folks,

Not specifically Xara related, but I need to create a copy of a ground plan in such a way that only the 'lines' are copied, meaning the 'remainder' of the (white) sheet becomes transparent.

Purpose is to import it in an svg capable prog (Sketchup) and continue working from there.

I was thinking of a color filter, where I could pick the color of the bluish paper to be filtered out, but honestly this is out of my league .

Any ideas?

Thanks for your help & suggestions,

Erwin