char *ident_to_file (const graph_ident_t *ident);
int ident_to_json (const graph_ident_t *ident,
yajl_gen handler);
-int ident_data_to_json (const graph_ident_t *ident,
+int ident_data_to_json (graph_ident_t *ident,
dp_time_t begin, dp_time_t end,
yajl_gen handler);