+_Bool graph_matches_ident (graph_config_t *cfg, const graph_ident_t *ident);
+
+/* Compares the given string with the appropriate field of the selector. If the
+ * selector field is "/all/" or "/any/", returns true without checking the
+ * instances. See "graph_inst_search_field" for finding all matching instances.
+ * */
+_Bool graph_matches_field (graph_config_t *cfg,
+ graph_ident_field_t field, const char *field_value);