GParamSpecs for file-path and uris

[Stefan Kost <ensonic hora-obscura de>]

hi,

is soemone aware of a GParamSpec implementation for file-path and  
uris. Most apps use GParamSpecString. Disadvantage is that one can put  
anaything there and for apps that generate UIs it impossible to detect  
that a file-cooser button would be more appropriate than a entry box.
I guess simillar would apply to fon-specifications.

Or any other ideas how to handle this.

Stefan