Tagging of items

Also-by: Michael Grammling <m.grammling@external.telekom.de>
Also-by: Andre Fuechsel <a.fuechsel@telekom.de>
Signed-off-by: Alex Tugarev <telekom@tugarev.de>
Does this really work? I would have expected that the model is already gone from the repository and thus its content cannot be read anymore...