maybe use document wrappers in keymanager
To manage SoledadDocuments: https://github.com/meskio/keymanager/commit/5095fc41c5f98d849299743201e7e8a63c0435a1#commitcomment-15122278 https://github.com/meskio/keymanager/commit/5095fc41c5f98d849299743201e7e8a63c0435a1#commitcomment-15128950 https://github.com/meskio/keymanager/commit/48b0dcdcce01875b890f32d913b0b678083524bb#commitcomment-15175626
(from redmine: created on 2016-01-11)