Clarified the format, in particular with regard to how 'mini' vs. 'maxi'

data effects field sizes.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9742 a95241bf-73f2-0310-859d-f6bbb57e9c96

docs/develop/app/bmessage.txt

@@ -10,16 +10,20 @@ Data field:
 Data		Bytes	Meaning
 			1		flags
 			4		type
+	// Mini data (all data less than 256 bytes total)
 			1		item count (*if* there is more than one)
 			1		data length
+	// Maxi data (all data more than 255 bytes total)
+			4		item count (*if* there is more than one)
+			4		data length
 			1		name length
 			X		name
 	// Single item
 			4		item size (*if* this is a variable sized item)
-			Y		data
+			Y		item data - NULL padded to 8-byte boundary
 	// Multiple items
-			4		item size (for variable sized items)
-			Y		item data - padded to 8-byte boundary
+			4		item size (*if* this is a variable sized item)
+			Y		item data - NULL padded to 8-byte boundary
 
 //------------------------------------------------------------------------------
 // An example