I still don't see this as a mainstream use case, but that's just me.
Yes, I'm aware of how the data is stored and how to link the data. To 
be exact, we would need to store both a source identifier and the 
contact's uid. Also, depending on the type of source you're using in 
Turba (not everybody uses a SQL based source), it's possible that only 
the user tagging the face would ever be able to see the tag. The 
comment about the permissions was referring to issues internal to 
Ansel in how gallery permissions are stored.



Linking the data is not the issue.  The issue is the overhead in 
performing the SQL queries in Ansel along with api calls for 
validation and permission checking for _each_and_every_ face. On an 
image view this may not be an issue, but for views that show multiple 
faces it can become a problem.



OTOH, I'd be more apt to include this if we allow ONLY the owner of an 
image to link a face to a contact AND to allow ONLY the owner of an 
image to see the link.



No, it's not impossible, but IMO it's not worth either the overhead or 
the time to implement it.  Like I said, if you (or anyone else) 
provides a patch, I'd be willing to look at it, and possibly add it as 
a feature that could be explicitly turned on.

i understand that it might be complicated, but so we have apps that 
don't work really together and information must be looked up everytime 
on my one. the permission issue isn't the problem from my point of 
view. if someone doesn't have the permisson to read the information 
from turba then don't provide a link or detail information, and if 
available do it. every turba entry has its own id in database, so only 
linking this id to the pic would be enough, permissions must then only 
be checked when detail information are queried

While this might work ok with a single, global address book, I think 
this would be of limited value and would complicate an already 
complicated permissions issue when dealing with faces and personal 
and/or non-share enabled address book sources.



I'd be willing to look at any patches, but I don't plan on implementing this.

it would be really nice to have a option to link face names to 
adresses from turba, so that when viewing a pic we can jump directly 
to the adress in turba to get more details from the person