Index: trunk/doc/developer/lihata_board/root_board.lht
===================================================================
--- trunk/doc/developer/lihata_board/root_board.lht	(revision 16818)
+++ trunk/doc/developer/lihata_board/root_board.lht	(revision 16819)
@@ -220,7 +220,7 @@
 					}
 				}
 			}
-			sy:conf = {/lht_tree_doc/roots/conf}
+			sy:conf = {/lht_tree_doc/roots/pcb-rnd-conf-v1}
 			sy:data = {/lht_tree_doc/comm/data}
 			sy:attributes@dup = {/lht_tree_doc/comm/attributes}
 		}
Index: trunk/doc/developer/lihata_board/root_conf.lht
===================================================================
--- trunk/doc/developer/lihata_board/root_conf.lht	(revision 16818)
+++ trunk/doc/developer/lihata_board/root_conf.lht	(revision 16819)
@@ -1,7 +1,22 @@
 ha:lht_tree_doc { ha:roots {
 
-	ha:conf {
-		TODO
+	ha:pcb-rnd-conf-v1 {
+		type=li
+		desc=complete pcb-rnd configuration tree
+		li:children {
+			ha:overwrite {
+				type=ha
+				desc={overwrite values while merging; children: a full or partial <a href="../../conf/groups.html#tree">config tree</a>}
+			}
+			ha:prepend {
+				type=ha
+				desc={prepend values while merging; children: a full or partial <a href="../../conf/groups.html#tree">config tree</a>}
+			}
+			ha:append {
+				type=ha
+				desc={append values while merging; children: a full or partial <a href="../../conf/groups.html#tree">config tree</a>}
+			}
+		}
 	}
 
 }}
Index: trunk/doc/developer/lihata_board/tree.html
===================================================================
--- trunk/doc/developer/lihata_board/tree.html	(revision 16818)
+++ trunk/doc/developer/lihata_board/tree.html	(revision 16819)
@@ -79,16 +79,19 @@
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;net <td> string <td> &nbsp; <td> net name whose attribute needs to be changed 
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;key <td> string <td> &nbsp; <td> key (name) of the attribute
 <tr><td> &nbsp;&nbsp;&nbsp;&nbsp;val <td> string <td> &nbsp; <td> new value of the attribute
-<tr><td> &nbsp;conf <td> &nbsp; <td> &nbsp; <td> <a href="#/lht_tree_doc/roots/conf"> -&gt; </a>
+<tr><td> &nbsp;li:conf <td> &nbsp; <td> &nbsp; <td> <a href="#/lht_tree_doc/roots/pcb-rnd-conf-v1">complete pcb-rnd configuration tree -&gt; </a>
 <tr><td> &nbsp;ha:data <td> &nbsp; <td> &nbsp; <td> <a href="#/lht_tree_doc/comm/data"> Layers and global objects of the board  -&gt; </a>
 <tr><td> &nbsp;ha:attributes <td> &nbsp; <td> &nbsp; <td>  a hash of attribute key=value pairs 
 <tr><td> &nbsp;&nbsp;attrib-key <td> string <td> &nbsp; <td> attribute value
 </table>
-<h3 id="/lht_tree_doc/roots/conf">:conf</h3>
+<h3 id="/lht_tree_doc/roots/pcb-rnd-conf-v1">li:pcb-rnd-conf-v1</h3>
 <p>
 <table border=0 cellspacing=0>
 <tr><th align=left> type:name <th align=left> value <th align=left> ver <th align=left> description
-<tr><td> conf <td> &nbsp; <td> &nbsp; <td> 
+<tr><td> li:pcb-rnd-conf-v1 <td> &nbsp; <td> &nbsp; <td> complete pcb-rnd configuration tree
+<tr><td> &nbsp;ha:overwrite <td> &nbsp; <td> &nbsp; <td> overwrite values while merging; children: a full or partial <a href="../../conf/groups.html#tree">config tree</a>
+<tr><td> &nbsp;ha:prepend <td> &nbsp; <td> &nbsp; <td> prepend values while merging; children: a full or partial <a href="../../conf/groups.html#tree">config tree</a>
+<tr><td> &nbsp;ha:append <td> &nbsp; <td> &nbsp; <td> append values while merging; children: a full or partial <a href="../../conf/groups.html#tree">config tree</a>
 </table>
 <h2> Common subtrees </h2>
 <p>Each table below describes a subtree that usually does not specify a whole tree (thus they are usually not a valid file on their own). These subtrees are described in a separate table because they are used from multiple other trees.
Index: trunk/doc/developer/lihata_board/tree.txt
===================================================================
--- trunk/doc/developer/lihata_board/tree.txt	(revision 16818)
+++ trunk/doc/developer/lihata_board/tree.txt	(revision 16819)
@@ -76,15 +76,18 @@
     net             string     net name whose attribute needs to be changed
     key             string     key (name) of the attribute
     val             string     new value of the attribute
- conf                          ->
+ li:conf                       complete pcb-rnd configuration tree ->
  ha:data                       Layers and global objects of the board ->
  ha:attributes                 a hash of attribute key=value pairs
   attrib-key        string     attribute value
 
-:conf
+li:pcb-rnd-conf-v1
 
-type:name  value ver description
-conf              
+type:name           value ver description
+li:pcb-rnd-conf-v1            complete pcb-rnd configuration tree
+ ha:overwrite                 overwrite values while merging; children: a full or partial config tree
+ ha:prepend                   prepend values while merging; children: a full or partial config tree
+ ha:append                    append values while merging; children: a full or partial config tree
 
 Common subtrees