We’ve been investigating options for storage and distribution of citation data in the Biodiversity Heritage Library. In particular, we are searching for an appropriate “core” format. The thought is that with an appropriately verbose, open, standard core format for our citations, we can transform that format into whatever other format we might want to support. By “verbose”, we mean a format that can support all of the information that we need to preserve. By “open”, we’re looking for a format that’s not tied exclusively to one system or vendor. And by “standard”, we’re hoping to identify a format that is widely recognized by the library community.