tree schema REFACTOR move ext definitions to plugins_exts header
diff --git a/src/printer_xml.c b/src/printer_xml.c
index 267fb09..b4921c0 100644
--- a/src/printer_xml.c
+++ b/src/printer_xml.c
@@ -25,6 +25,7 @@
 #include "out.h"
 #include "out_internal.h"
 #include "parser_data.h"
+#include "plugins_exts/metadata.h"
 #include "plugins_types.h"
 #include "printer_data.h"
 #include "printer_internal.h"