This article summarizes the approach to bibliographic metadata developed at the University of Michigan Library for journal articles published and archived in HathiTrust using the mPach toolset, which allows journal editors to create born-digital Open Access journals and create their own metadata as a byproduct of the publishing process. Specifically, mPach allows a journal editor to convert edited manuscripts from common source formats such as Microsoft Word into Journal Article Tag Suite (JATS) Z39.96-2012, XML and embed structured metadata about the article and journal. Since HathiTrust currently uses machine-readable cataloging (MARC) as its common-denominator metadata format, JATS metadata are automatically mapped to MARC fields, creating one analytic record per article but without normalizing to follow Resource Description and Access rules for transcription from primary sources of information or creating entries according to name authorities. For each new journal, a serial record for the journal is created manually by a serials cataloger. This serial record and each analytic record for articles in that journal link to a “collection” for the journal built using the HathiTrust Collections feature.