+/** \brief get element set name from RecordComposition
+ \param comp record composition
+ \returns element set name or NULL if no element set name was given
+*/
+YAZ_EXPORT
+const char *yaz_get_esn(Z_RecordComposition *comp);
+
+/** \brief set element set name in RecordComposition struct
+ \param comp_p record composition ptr
+ \param esn element set name string
+ \param nmem memory for result composition
+*/
+YAZ_EXPORT
+void yaz_set_esn(Z_RecordComposition **comp_p, const char *esn, NMEM nmem);
+
+