Use string_value() in metadata. 
Use string_value() in metadata. 
alephdata/aleph,smmbllsm/aleph,alephdata/aleph,alephdata/aleph,pudo/aleph,pudo/aleph,pudo/aleph,gazeti/aleph,smmbllsm/aleph,OpenGazettes/aleph,OpenGazettes/aleph,OpenGazettes/aleph,smmbllsm/aleph,gazeti/aleph,gazeti/aleph,OpenGazettes/aleph,alephdata/aleph,gazeti/aleph,alephdata/aleph