An mmCIF file can say a residue has two alternate conformations and how often each appears. It cannot say which alternates occur together in the same copy. A draft proposal for recording that correlation, plus a tool to inspect it: diffuse.science/posts/mmcif-...
mmCIF Explorer and the Heterogeneity Proposal
A playground for the PDBx/mmCIF file exploration, a look at the current proposal for encoding correlated heterogeneity
diffuse.science