SIFD-5 adding new attribute period to author and mapping to its data in the ADL TEI P5 datastream, also with a test
Merge branch 'master' of https://github.com/Det-Kongelige-Bibliotek/ADL
Merge branch 'master' of https://github.com/Det-Kongelige-Bibliotek/ADL
SIFD-5 adding comment to TEI P5 datastream class