In this paper the authors show an overview of Virtual Digital Mathematics
Library in Japan (DML-JP), contents of which consist of metadata harvested from
institutional repositories in Japan and digital repositories in the world.
DML-JP is, in a sense, a subject specific repository which collaborate with
various digital repositories. Beyond portal website, DML-JP provides
subject-specific metadata through OAI-ORE. By the schema it is enabled that
digital repositories can load the rich metadata which were added by
mathematicians