-extern size_t default_channel_subbuf_size;
-extern size_t default_metadata_subbuf_size;
-extern size_t default_ust_pid_channel_subbuf_size;
-extern size_t default_ust_uid_channel_subbuf_size;
-extern size_t default_kernel_channel_subbuf_size;
+/* Default LTTng MI XML namespace. */
+#define DEFAULT_LTTNG_MI_NAMESPACE "http://lttng.org/xml/ns/lttng-mi"