Added mapping for dc: - used for dc:source - Acknowledgements
Added mapping for dc: - used for dc:source - Acknowledgements

schemaorg/schemaorg,lanthaler/schemaorg,dbs/schemaorg,vholland/schemaorg,vholland/schemaorg,tfrancart/schemaorg,tfrancart/schemaorg,dbs/schemaorg,schemaorg/schemaorg,schemaorg/schemaorg,gkellogg/schemaorg,gkellogg/schemaorg,vholland/schemaorg,dbs/schemaorg,vholland/schemaorg,unor/schemaorg,tfrancart/schemaorg,gkellogg/schemaorg,schemaorg/schemaorg,dbs/schemaorg,twamarc/schemaorg,gkellogg/schemaorg,lanthaler/schemaorg,twamarc/schemaorg,tfrancart/schemaorg,schemaorg/schemaorg,twamarc/schemaorg,lanthaler/schemaorg,unor/schemaorg,unor/schemaorg