Hi Andrew,

 >
> Yes, this would be possible.  This is similar to how the object tree
> in dbus-service.c could rebuild the paths from node pointers but
> instead some functions receive the path string and the node pointer to
> avoid this.  Let's keep thinking if we want to do that, but the IDs
> work well for kdbus.  If we change this, kdbus could pass a hash of
> the rule string as the cookie.

Actually we could send both.  The rules and the id to both add and 
remove match methods.  We already have the id, so no need to calculate 
any hashes.

Regards,
-Denis