ArtFrame, led by Columbia University, is an extension of BIBFRAME to describe art objects, both two-dimensional (e.g., paintings, photographs) and three-dimensional (e.g., sculptures, ceramics).
RareMat (Rare Materials Ontology Extension), led by Cornell University in conjunction with the ACRL Rare Books and Manuscript Section's Bibliographic Standards Committee (RBMS-BSC) is intended to provide modeling for handling the complexity of rare materials, particularly item-level description not addressed in BIBFRAME 2.0 or bibliotek-o. Adoption and usage of the Rare Materials Ontology Extension will be determined by RBMS-BSC following initial development and assessment.
For a number of modeling areas, such as measurements, provenance and physical description, the ArtFrame and RareMat groups partnered to address overlapping use cases.