Index: trunk/doc/developer/lihata_format/comm_concrete.lht
===================================================================
--- trunk/doc/developer/lihata_format/comm_concrete.lht	(revision 4291)
+++ trunk/doc/developer/lihata_format/comm_concrete.lht	(revision 4292)
@@ -15,6 +15,8 @@
 				desc { List of child objects }
 				li:children {
 					sy:line.ID    = {/lht_tree_doc/comm/line.ID}
+					sy:arc.ID     = {/lht_tree_doc/comm/arc.ID}
+					sy:polygon.ID = {/lht_tree_doc/comm/arc.ID}
 					ha:obj.ID     = { valtype=none;    desc={list of any concrete object }}
 				}
 			}
@@ -62,4 +64,42 @@
 		}
 	}
 
+	ha:arc.ID {
+		type=ha
+		desc { Drawing object: circular arc }
+		li:children {
+			ha:cx      = { valtype=coord;    desc={center point, x coord }}
+			ha:cy      = { valtype=coord;    desc={center point, y coord }}
+			ha:r       = { valtype=coord;    desc={radius }}
+			ha:sang    = { valtype=angle;    desc={start angle }}
+			ha:dang    = { valtype=angle;    desc={delta angle }}
+			ha:sx      = { valtype=coord;    desc={start point, x coord }}
+			ha:sy      = { valtype=coord;    desc={start point, y coord }}
+			ha:ex      = { valtype=coord;    desc={end point, x coord }}
+			ha:ey      = { valtype=coord;    desc={end point, y coord }}
+			ha:stroke  = { valtype=pen;      desc={pen to use }}
+			ha:lock    = { valtype=bool;     desc={object is locked }}
+			ha:floater = { valtype=bool;     desc={"group lock" doesn't apply }}
+		}
+	}
+
+	ha:polygon.ID {
+		type=ha
+		desc { Drawing object: polygon }
+		li:children {
+			ha:outline {
+				type=li
+				desc { ordered list of contour objects (no gaps allowed) }
+				li:children {
+					sy:line.ID    = {/lht_tree_doc/comm/line.ID}
+					sy:arc.ID     = {/lht_tree_doc/comm/arc.ID}
+				}
+			}
+			ha:stroke  = { valtype=pen;      desc={pen used for outline objects }}
+			ha:fill    = { valtype=pen;      desc={pen used for fill (no fill if not present)}}
+			ha:lock    = { valtype=bool;     desc={object is locked }}
+			ha:floater = { valtype=bool;     desc={"group lock" doesn't apply }}
+		}
+	}
+
 }}