Index: slv2/slv2/types.h
===================================================================
--- slv2/slv2/types.h	(revision 216)
+++ slv2/slv2/types.h	(working copy)
@@ -51,6 +51,8 @@
 /** lv2:float, IEEE-754 32-bit floating point number */
 #define SLV2_DATA_TYPE_FLOAT "http://lv2plug.in/ontology#float"
 
+/** MIDI datatype as specified at http://ll-plugins.nongnu.org/ext/miditype/ */
+#define SLV2_DATA_TYPE_MIDI "http://ll-plugins.nongnu.org/lv2/ext/miditype"
 
 #ifdef __cplusplus
 }