XmlmmCIF equivalent: struct_conn_type Data items in the STRUCT_CONN_TYPE category record details about the criteria used to identify interactions between portions of the structure. XmlmmCIF equivalent: struct_conn_type/criteria The criteria used to define the interaction. XmlmmCIF equivalent: struct_conn_type/reference A reference that specifies the criteria used to define the interaction. XmlmmCIF equivalent: struct_conn_type/id The chemical or structural type of the interaction.