Takao Namiki, Hiraku Kuroda, and Shunsuke Naruse have self-archived "Experimental DML over Digital Repositories in Japan" in arXiv.org.
Here's an excerpt:
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.