Index: trunk/doc/design/02_data.html
===================================================================
--- trunk/doc/design/02_data.html	(revision 178)
+++ trunk/doc/design/02_data.html	(revision 179)
@@ -169,13 +169,14 @@
 The graphical representation of (a part of) a component is called symbol.
 
 <p>{des2:19}
-A symbol is a group of ports, bus-ports, attributes, other symbols
-and decoration (drawing primitives - TODO: link
-the later chapter about this). When a symbol is placed on a schematic
-sheet (either by copy or by reference), it is <i>instantiated</i>. A
-symbol has a creation-time cschem generated unique ID ("symbol UID"), and
-an instantiation-time cschem generated unique ID for each instance
-("instance UID").
+A symbol is a <a href="03_drawing.html#des3:53"> group </a> or <a
+href="03_drawing.html#des3:57">group_ref</a> with symbol-related
+attributes. It typically contains furhter groups for terminals,
+bus-terminals, other symbols and decoration. When a symbol is placed on
+a schematic sheet (either by copy or by reference), it is
+<i>instantiated</i>. A symbol has a creation-time cschem generated
+unique ID ("symbol UID"), and an instantiation-time cschem generated
+unique ID for each instance ("instance UID").
 
 <p>{des2:53}
 When an existing instance is moved within the sheet, renamed, its