Index: trunk/doc/developer/lihata_format/comm_concrete.lht
===================================================================
--- trunk/doc/developer/lihata_format/comm_concrete.lht	(revision 4484)
+++ trunk/doc/developer/lihata_format/comm_concrete.lht	(revision 4485)
@@ -4,6 +4,8 @@
 		type=ha
 		desc { Group of concrete objects }
 		li:children {
+			ha:uuid      = { valtype=minuid;   desc={instance UID }}
+			ha:src_uuid  = { valtype=minuid;   desc={source UID }}
 			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:rot       = { valtype=angle;    desc={xform: rotate placement }}
Index: trunk/doc/developer/lihata_format/group.ID.svg
===================================================================
--- trunk/doc/developer/lihata_format/group.ID.svg	(revision 4484)
+++ trunk/doc/developer/lihata_format/group.ID.svg	(revision 4485)
@@ -4,292 +4,324 @@
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Index: trunk/doc/developer/lihata_format/tree.html
===================================================================
--- trunk/doc/developer/lihata_format/tree.html	(revision 4484)
+++ trunk/doc/developer/lihata_format/tree.html	(revision 4485)
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 <tr id="/lht_tree_doc/comm/group.ID"><td> ha:group.ID <td> &nbsp; <td> &nbsp; <td>  Group of concrete objects 
+<tr id="/lht_tree_doc/comm/group.ID/children/uuid"><td> &nbsp;uuid <td> <a href="#valtype:minuid">minuid</a> <td> &nbsp; <td> instance UID 
+<tr id="/lht_tree_doc/comm/group.ID/children/src_uuid"><td> &nbsp;src_uuid <td> <a href="#valtype:minuid">minuid</a> <td> &nbsp; <td> source UID 
 <tr id="/lht_tree_doc/comm/group.ID/children/x"><td> &nbsp;x <td> <a href="#valtype:coord">coord</a> <td> &nbsp; <td> xform: translate placement in x (horizontal) direction 
 <tr id="/lht_tree_doc/comm/group.ID/children/y"><td> &nbsp;y <td> <a href="#valtype:coord">coord</a> <td> &nbsp; <td> xform: translate placement in y (vertical) direction 
 <tr id="/lht_tree_doc/comm/group.ID/children/rot"><td> &nbsp;rot <td> <a href="#valtype:angle">angle</a> <td> &nbsp; <td> xform: rotate placement 
Index: trunk/doc/developer/lihata_format/tree.txt
===================================================================
--- trunk/doc/developer/lihata_format/tree.txt	(revision 4484)
+++ trunk/doc/developer/lihata_format/tree.txt	(revision 4485)
@@ -50,6 +50,8 @@
 
 type:name            value   ver description
 ha:group.ID                      Group of concrete objects
+ uuid                minuid      instance UID
+ src_uuid            minuid      source UID
  x                   coord       xform: translate placement in x (horizontal) direction
  y                   coord       xform: translate placement in y (vertical) direction
  rot                 angle       xform: rotate placement