[Nepomuk] How to detect new/removed tags from a Soprano::Statement?

[Christian Mollekopf]

hi,

Does anybody know how I can detect when a new Tag was added/removed to/from 
Nepomuk? I.e. to update a Tag Cloud.

Currently I listen to the statementAdded/statementRemoved signals of the 
Soprano::Model, and I can also detect if an Item gets a new Tag, but I don't 
know how I can see from the Statement when a new Tag was created or a Tag was 
deleted.

Cheers,

Chris