Semantic media retrieval UC : an update

Dear colleagues,

Have a look at the updated UC on Semantic media retrieval.
http://www.w3.org/2005/Incubator/mmsem/wiki/Semantic_Media_Retrieval_Use_case

Please, don't hesitate to express either comments or any direct additions to the existing UC description. 

Looking forward to hearing from you,

best regards,

Ioannis Pratikakis