XmlmmCIF equivalent: struct_conf_type Data items in the STRUCT_CONF_TYPE category record details about the criteria used to identify backbone conformations of a segment of polymer. XmlmmCIF equivalent: struct_conf_type/criteria The criteria used to assign this conformation type. XmlmmCIF equivalent: struct_conf_type/reference A literature reference that defines the criteria used to assign this conformation type and subtype. XmlmmCIF equivalent: struct_conf_type/id The descriptor that categorizes type of the conformation of the backbone of the polymer (whether protein or nucleic acid). Explicit values for the torsions angles that define each conformation are not given here, but it is expected that the author would provide such information in either the _struct_conf_type.criteria or _struct_conf_type.reference data items, or both.