XmlmmCIF equivalent: pdbx_xplor_file Parameter and topology files used in X-PLOR/CNS refinement. XmlmmCIF equivalent: pdbx_xplor_file/param_file Parameter file name in X-PLOR/CNS refinement. XmlmmCIF equivalent: pdbx_xplor_file/topol_file Topology file name in X-PLOR/CNS refinement. XmlmmCIF equivalent: pdbx_xplor_file/serial_no Serial number.