This paper summarizes ongoing research at Jagiellon University (JU) to address the problem of metadata storage in cultural heritage object research. It addresses the lack of flexibility in core standards such as MARC 21 and Dublin Core, which leaves no room for storing the rich metadata currently being generated. The paper compares the metadata of objects such as manuscripts, placards, and obituaries collected at JU with five widely used metadata standards: Dublin Core, EAD, MODS, EDM, and Digital Scriptorium. Initial results demonstrate difficulties in mapping between standards, but provide requirements for maximizing the interoperability of the JU cultural heritage metadata schema. Future experiments will be conducted to verify the feasibility of mapping in practice and the possibility of integrating with various metadata formats as the conceptual model evolves.