Index: mttroot/mtt/lib/examples/Dia/robotrain/robotrain_state.txt
==================================================================
--- mttroot/mtt/lib/examples/Dia/robotrain/robotrain_state.txt
+++ mttroot/mtt/lib/examples/Dia/robotrain/robotrain_state.txt
@@ -3,15 +3,18 @@
 ## 
 ## System robotrain, representation state, language txt; 
 ## File robotrain_state.txt; 
 ## Generated by MTT on Sun Sep 12 18:46:40 BST 2004; 
 
-robotrain__tractor__yaw__mttC		= 0.0;
-robotrain__front__mttINTF__mttC		= -D;
-robotrain__front__mttINTF_2__mttC	= 0.0;
-robotrain__front__yaw__mttC		= 0.0;
-robotrain__middle__mttINTF__mttC	= -(D+L+D);
-robotrain__middle__mttINTF_2__mttC	= 0.0;
-robotrain__middle__yaw__mttC		= 0.0;
-robotrain__rear__mttINTF__mttC		= -(D+L+D+L+D);
-robotrain__rear__mttINTF_2__mttC	= 0.0;
-robotrain__rear__yaw__mttC		= 0.0;
+robotrain__tractor__yaw__mttC	= 0.0;
+
+robotrain__front__x_e__mttC	= -D;
+robotrain__front__y_e__mttC	= 0.0;
+robotrain__front__yaw__mttC	= 0.0;
+
+robotrain__middle__x_e__mttC	= -(D+L+D);
+robotrain__middle__y_e__mttC	= 0.0;
+robotrain__middle__yaw__mttC	= 0.0;
+
+robotrain__rear__x_e__mttC	= -(D+L+D+L+D);
+robotrain__rear__y_e__mttC	= 0.0;
+robotrain__rear__yaw__mttC	= 0.0;

Index: mttroot/mtt/lib/examples/Dia/robotrain/trailer_abg.dia
==================================================================
--- mttroot/mtt/lib/examples/Dia/robotrain/trailer_abg.dia
+++ mttroot/mtt/lib/examples/Dia/robotrain/trailer_abg.dia
@@ -674,11 +674,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O16">
       <dia:attribute name="obj_pos">
         <dia:point val="47.4169,36.0036"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="41.5718,34.0969;45.6004,36.8035"/>
+        <dia:rectangle val="38.2053,34.0636;46.4674,36.7702"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="47.4169,36.0036"/>
         <dia:point val="37.3169,35.9036"/>
       </dia:attribute>
@@ -720,11 +720,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O17">
       <dia:attribute name="obj_pos">
         <dia:point val="37.3084,28.9743"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="37.2213,30.2735;40.0145,34.1514"/>
+        <dia:rectangle val="37.2224,29.3228;40.0157,35.1021"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="37.3084,28.9743"/>
         <dia:point val="37.3169,35.9036"/>
       </dia:attribute>
@@ -888,11 +888,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O20">
       <dia:attribute name="obj_pos">
         <dia:point val="37.3169,35.9036"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="25.5726,34.0536;34.4497,36.7536"/>
+        <dia:rectangle val="24.7053,34.0536;37.8169,36.7536"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="37.3169,35.9036"/>
         <dia:point val="23.8169,35.9036"/>
       </dia:attribute>
@@ -980,11 +980,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O22">
       <dia:attribute name="obj_pos">
         <dia:point val="23.8169,35.9036"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="12.5695,34.0536;21.9999,36.7536"/>
+        <dia:rectangle val="9.20534,34.0536;22.8669,36.7536"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="23.8169,35.9036"/>
         <dia:point val="8.31694,35.9036"/>
       </dia:attribute>
@@ -1375,11 +1375,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O30">
       <dia:attribute name="obj_pos">
         <dia:point val="23.8169,35.9036"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="23.5525,31.1557;24.9346,34.1016"/>
+        <dia:rectangle val="23.5128,30.2028;24.9742,35.0545"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="23.8169,35.9036"/>
         <dia:point val="23.567,29.9036"/>
       </dia:attribute>
@@ -1995,11 +1995,11 @@
           </dia:attribute>
           <dia:attribute name="height">
             <dia:real val="1"/>
           </dia:attribute>
           <dia:attribute name="pos">
-            <dia:point val="37.3084,29.2743"/>
+            <dia:point val="37.3083,29.2743"/>
           </dia:attribute>
           <dia:attribute name="color">
             <dia:color val="#000000"/>
           </dia:attribute>
           <dia:attribute name="alignment">
@@ -2014,20 +2014,20 @@
         <dia:boolean val="false"/>
       </dia:attribute>
     </dia:object>
     <dia:object type="BondGraph - MTT port" version="0" id="O42">
       <dia:attribute name="obj_pos">
-        <dia:point val="45.65,39.7"/>
+        <dia:point val="44.6812,39.7"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="45.6,39.65;49.2714,41.5571"/>
+        <dia:rectangle val="44.6312,39.65;50.2401,41.5571"/>
       </dia:attribute>
       <dia:attribute name="elem_corner">
-        <dia:point val="45.65,39.7"/>
+        <dia:point val="44.6812,39.7"/>
       </dia:attribute>
       <dia:attribute name="elem_width">
-        <dia:real val="3.5713834764831756"/>
+        <dia:real val="5.5088834764831933"/>
       </dia:attribute>
       <dia:attribute name="elem_height">
         <dia:real val="1.8071067811865469"/>
       </dia:attribute>
       <dia:attribute name="line_width">
@@ -2047,11 +2047,11 @@
         <dia:real val="1"/>
       </dia:attribute>
       <dia:attribute name="text">
         <dia:composite type="text">
           <dia:attribute name="string">
-            <dia:string>#INTF#</dia:string>
+            <dia:string>#INTF:x_e#</dia:string>
           </dia:attribute>
           <dia:attribute name="font">
             <dia:font family="serif" style="80" name="Times-Roman"/>
           </dia:attribute>
           <dia:attribute name="height">
@@ -2075,20 +2075,20 @@
         <dia:boolean val="false"/>
       </dia:attribute>
     </dia:object>
     <dia:object type="BondGraph - MTT port" version="0" id="O43">
       <dia:attribute name="obj_pos">
-        <dia:point val="40.7143,28.05"/>
+        <dia:point val="39.7456,28.05"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="40.6643,28;44.3357,29.9071"/>
+        <dia:rectangle val="39.6956,28;45.3044,29.9071"/>
       </dia:attribute>
       <dia:attribute name="elem_corner">
-        <dia:point val="40.7143,28.05"/>
+        <dia:point val="39.7456,28.05"/>
       </dia:attribute>
       <dia:attribute name="elem_width">
-        <dia:real val="3.5713834764831982"/>
+        <dia:real val="5.5088834764831791"/>
       </dia:attribute>
       <dia:attribute name="elem_height">
         <dia:real val="1.8071067811865476"/>
       </dia:attribute>
       <dia:attribute name="line_width">
@@ -2108,11 +2108,11 @@
         <dia:real val="1"/>
       </dia:attribute>
       <dia:attribute name="text">
         <dia:composite type="text">
           <dia:attribute name="string">
-            <dia:string>#INTF#</dia:string>
+            <dia:string>#INTF:y_e#</dia:string>
           </dia:attribute>
           <dia:attribute name="font">
             <dia:font family="serif" style="80" name="Times-Roman"/>
           </dia:attribute>
           <dia:attribute name="height">
@@ -2261,11 +2261,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O46">
       <dia:attribute name="obj_pos">
         <dia:point val="56.1107,35.8536"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="49.1716,34.0634;52.715,36.7911"/>
+        <dia:rectangle val="48.305,34.021;55.1755,36.8061"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="56.1107,35.8536"/>
         <dia:point val="47.4169,36.0036"/>
       </dia:attribute>
@@ -2307,11 +2307,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O47">
       <dia:attribute name="obj_pos">
         <dia:point val="37.2607,21.4036"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="36.4227,22.696;38.4961,27.2167"/>
+        <dia:rectangle val="36.4167,21.746;38.5021,28.1668"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="37.2607,21.4036"/>
         <dia:point val="37.3084,28.9743"/>
       </dia:attribute>
@@ -2353,11 +2353,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O48">
       <dia:attribute name="obj_pos">
         <dia:point val="37.3084,28.9743"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="38.1477,27.1109;40.7199,29.7628"/>
+        <dia:rectangle val="38.6399,27.1169;40.0535,29.7601"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="37.3084,28.9743"/>
         <dia:point val="42.5,28.9536"/>
       </dia:attribute>
@@ -2364,10 +2364,16 @@
       <dia:attribute name="numcp">
         <dia:int val="1"/>
       </dia:attribute>
       <dia:attribute name="line_width">
         <dia:real val="0.050000000000000003"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_start_gap">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_end_gap">
+        <dia:real val="1"/>
       </dia:attribute>
       <dia:attribute name="object_edge_start">
         <dia:boolean val="true"/>
       </dia:attribute>
       <dia:attribute name="object_edge_end">
@@ -2396,11 +2402,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O49">
       <dia:attribute name="obj_pos">
         <dia:point val="47.4169,36.0036"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="46.6297,36.3024;48.6318,39.8449"/>
+        <dia:rectangle val="46.6256,37.2919;48.6277,38.8449"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="47.4169,36.0036"/>
         <dia:point val="47.4357,40.6036"/>
       </dia:attribute>
@@ -2407,10 +2413,16 @@
       <dia:attribute name="numcp">
         <dia:int val="1"/>
       </dia:attribute>
       <dia:attribute name="line_width">
         <dia:real val="0.050000000000000003"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_start_gap">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_end_gap">
+        <dia:real val="1"/>
       </dia:attribute>
       <dia:attribute name="object_edge_start">
         <dia:boolean val="true"/>
       </dia:attribute>
       <dia:attribute name="object_edge_end">
@@ -2539,11 +2551,11 @@
           </dia:attribute>
           <dia:attribute name="height">
             <dia:real val="1"/>
           </dia:attribute>
           <dia:attribute name="pos">
-            <dia:point val="47.4215,45.2536"/>
+            <dia:point val="47.4214,45.2536"/>
           </dia:attribute>
           <dia:attribute name="color">
             <dia:color val="#000000"/>
           </dia:attribute>
           <dia:attribute name="alignment">
@@ -2561,11 +2573,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O52">
       <dia:attribute name="obj_pos">
         <dia:point val="42.5,28.9536"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="44.308,27.1352;46.6263,29.7972"/>
+        <dia:rectangle val="45.5148,27.1565;46.9382,29.8257"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="42.5,28.9536"/>
         <dia:point val="48.3215,29.0536"/>
       </dia:attribute>
@@ -2572,10 +2584,16 @@
       <dia:attribute name="numcp">
         <dia:int val="1"/>
       </dia:attribute>
       <dia:attribute name="line_width">
         <dia:real val="0.050000000000000003"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_start_gap">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_end_gap">
+        <dia:real val="1"/>
       </dia:attribute>
       <dia:attribute name="object_edge_start">
         <dia:boolean val="true"/>
       </dia:attribute>
       <dia:attribute name="object_edge_end">
@@ -2604,11 +2622,11 @@
     <dia:object type="BondGraph - MTT bond" version="0" id="O53">
       <dia:attribute name="obj_pos">
         <dia:point val="47.4357,40.6036"/>
       </dia:attribute>
       <dia:attribute name="obj_bb">
-        <dia:rectangle val="46.6323,40.9101;48.6326,44.2048"/>
+        <dia:rectangle val="46.6356,41.6437;48.6293,43.2049"/>
       </dia:attribute>
       <dia:attribute name="conn_endpoints">
         <dia:point val="47.4357,40.6036"/>
         <dia:point val="47.4215,44.9536"/>
       </dia:attribute>
@@ -2615,10 +2633,16 @@
       <dia:attribute name="numcp">
         <dia:int val="1"/>
       </dia:attribute>
       <dia:attribute name="line_width">
         <dia:real val="0.050000000000000003"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_start_gap">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="absolute_end_gap">
+        <dia:real val="1"/>
       </dia:attribute>
       <dia:attribute name="object_edge_start">
         <dia:boolean val="true"/>
       </dia:attribute>
       <dia:attribute name="object_edge_end">

Index: mttroot/mtt/lib/examples/Dia/robotrain/trailer_lbl.txt
==================================================================
--- mttroot/mtt/lib/examples/Dia/robotrain/trailer_lbl.txt
+++ mttroot/mtt/lib/examples/Dia/robotrain/trailer_lbl.txt
@@ -39,10 +39,12 @@
 ## Component type Df
 	omega	  SS		external		
 	v	  SS		external		
 
 ## Component type INTF
+	x_e	  none
+	y_e	  none
 	yaw	  none				
 
 ## Component type SS
 	[x1]	  SS		external,external		
 	[x2]	  SS		external,external