Index: trunk/doc/developer/lihata_format/comm_concrete.lht
===================================================================
--- trunk/doc/developer/lihata_format/comm_concrete.lht	(revision 4283)
+++ trunk/doc/developer/lihata_format/comm_concrete.lht	(revision 4284)
@@ -22,7 +22,7 @@
 		li:children {
 			ha:x         = { valtype=coord;    desc={xform: translate placement in x (horizontal) direction }}
 			ha:y         = { valtype=coord;    desc={xform: translate placement in y (vertical) direction }}
-			ha:ref       = { valtype=string;   desc={oidpath to the referee (should be a group) }}
+			ha:ref       = { valtype=oidpath;  desc={path relative to sheet root, to the referee (should be a group) }}
 			ha:child_xform {
 				type=li
 				desc { List of child object transformation to be performed after placement }
Index: trunk/doc/developer/lihata_format/types.lht
===================================================================
--- trunk/doc/developer/lihata_format/types.lht	(revision 4283)
+++ trunk/doc/developer/lihata_format/types.lht	(revision 4284)
@@ -31,5 +31,9 @@
  Free form text data
 }
 
+oidpath {
+ A slash separated list of integer object IDs (oids).
+}
+
 }}