+/** \brief converts CQL tree to CCL and writes result to buffer
+ \param cn CQL node (tree)
+ \param out buffer
+ \param max size of buffer (max chars to write)
+ \retval 0 OK
+ \retval -1 conversion error
+ \retval -2 buffer too small (truncated)
+ */
+YAZ_EXPORT
+int cql_to_ccl_buf(struct cql_node *cn, char *out, int max);
+