+int ident_set_host (graph_ident_t *ident, const char *host);
+int ident_set_plugin (graph_ident_t *ident, const char *plugin);
+int ident_set_plugin_instance (graph_ident_t *ident,
+ const char *plugin_instance);
+int ident_set_type (graph_ident_t *ident, const char *type);
+int ident_set_type_instance (graph_ident_t *ident,
+ const char *type_instance);
+