Example:
io.register_format("mmCIF", "Molecular structure", (".cif",), ("mmcif", "cif"), mime=("chemical/x-cif", "chemical/x-mmcif"), reference="http://mmcif.wwpdb.org/", requires_seeking=True, open_func=open_mmCIF)
<no title>
structaccess: batch access to molecular data
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