SCM_API SCM scm_port_filename (SCM port);
SCM_API SCM scm_set_port_filename_x (SCM port, SCM filename);
-/* Port alist. */
-SCM_INTERNAL SCM scm_i_port_alist (SCM port);
-SCM_INTERNAL void scm_i_set_port_alist_x (SCM port, SCM alist);
+/* Port properties. */
+SCM_INTERNAL SCM scm_i_port_property (SCM port, SCM key);
+SCM_INTERNAL SCM scm_i_set_port_property_x (SCM port, SCM key, SCM value);
/* Implementation helpers for port printing functions. */
SCM_API int scm_port_print (SCM exp, SCM port, scm_print_state *);