diff --git a/src/app/app.py b/src/app/app.py
index f9367091b216db90228cd9db81e6f6b4d0960603..972bb23c0ca863772f2c9a801f4233b1ec9ce0e7 100644
--- a/src/app/app.py
+++ b/src/app/app.py
@@ -53,27 +53,27 @@ def convertUnl(unl, outputs):
 
     # Handle rdf output if any
     if 'rdf' in outputs:
-        fname = '{}/{}.ttl'.format(out_dir, out_name)
-        with open(fname, 'r') as f:
-            res['rdf'] = f.read()
         try:
+            fname = '{}/{}.ttl'.format(out_dir, out_name)
+            with open(fname, 'r') as f:
+                res['rdf'] = f.read()
             os.remove(fname)
         except FileNotFoundError:
-            pass
+            res['rdf'] = 'Error : no ttl file'
 
     # Handle dot output if any
     if 'dot' in outputs:
-        fname = '{}/{}.dot'.format(out_dir, out_name)
-        cmd = ['dot', '-Tsvg', fname]
-        with Popen(cmd, stdout=PIPE, stderr=PIPE) as p:
-            p.wait()
-            if p.returncode != 0:
-                res['error'] += "Dot: \n\n"+p.stderr.read().decode()
-            else:
-                res['dot'] = p.stdout.read().decode()
         try:
-            os.remove(fname)
+            fname = '{}/{}.dot'.format(out_dir, out_name)
+            cmd = ['dot', '-Tsvg', fname]
+            with Popen(cmd, stdout=PIPE, stderr=PIPE) as p:
+                p.wait()
+                if p.returncode != 0:
+                    res['error'] += "Dot: \n\n"+p.stderr.read().decode()
+                else:
+                    res['dot'] = p.stdout.read().decode()
+                os.remove(fname)
         except FileNotFoundError:
-            pass
+            res['dot'] = 'Error : no dot file'
 
     return res
diff --git a/src/app/templates/unl2rdf.html b/src/app/templates/unl2rdf.html
index a5e33ff1a6f26cbc0948216b33acf4d2756a37d5..d28a94519a8f64fa5b600b24c9d65fd768a2aa55 100644
--- a/src/app/templates/unl2rdf.html
+++ b/src/app/templates/unl2rdf.html
@@ -5,7 +5,43 @@
 <div class="form-group">
     <form action="{{request.path}}" method="POST">
         <h2>Enter some UNL here I will convert it for you</h2>
-        <textarea class="form-control" name="unl" cols="80" rows="10" style="width: 300px; height: 150px;"></textarea>
+        <textarea class="form-control" name="unl" cols="120" rows="30" style="width: 80%;">
+; Type in your UNL text, it may be a simple graph enclosed in [S] and [/S] tags
+; or a structures UNL documents using [D] [P] [T] [S] flags
+; with or without the multilingual facets (enclosed in {org}, {fr}, etc... flags
+[D]
+[S:R1]
+{org:en}
+The system allows a radio channel to take on two states: Listening and Traffic.
+{/org}
+{unl}
+aoj( allow(icl>be, aoj>thing, ben>thing, obj>uw, equ>make_possible).@entry, system(icl>group).@def )
+obj( allow(icl>be, aoj>thing, ben>thing, obj>uw, equ>make_possible).@entry, take_on(aoj>thing, equ>assume,icl>change, obj>thing) )
+ben( allow(icl>be, aoj>thing, ben>thing, obj>uw, equ>make_possible).@entry, channel(icl>radiowave).@indef)
+aoj( take_on(aoj>thing, equ>assume, icl>change, obj>thing), channel(icl>radiowave).@indef ) 
+obj( take_on(aoj>thing, equ>assume, icl>change, obj>thing), state(icl>attribute).@plu )   
+qua( state(icl>attribute).@plu, 2 )   
+cnt( state(icl>attribute).@plu, listening(icl>sensing) )
+and( listening(icl>sensing),traffic(icl>communication) )
+{/unl}
+[/S]
+[S:R2]
+{org:en}
+The system displays a channel in green when it is in broadcast state. 
+{/org}
+{unl}
+agt(display(icl>show,equ>exhibit,agt>thing,obj>thing).@entry.@present,system(icl>group).@def)
+mod(channel(icl>radiowave).@indef,green(icl>adj,iof>color))
+obj(display(icl>show,equ>exhibit,agt>thing,obj>thing).@entry.@present,channel(icl>radiowave).@indef)
+tim(display(icl>show,equ>exhibit,agt>thing,obj>thing).@entry.@present,when(icl>how,com>always,tim<uw,obj>uw))
+aoj:01(be_in_a_state(aoj>thing,icl>be,obj>state).@entry.@present,channel(icl>radiowave).@indef)
+plc:01(state(icl>attribute),broadcast(icl>message))
+obj:01(be_in_a_state(aoj>thing,icl>be,obj>state).@entry.@present,state(icl>attribute))
+obj(when(icl>how,com>always,tim<uw,obj>uw),:01)
+{/unl}
+[/S] 
+[/D]
+        </textarea>
         <h2>Tell me which output(s) you want</h2>
         <ul>
             <li><label><input type="checkbox" name="outputs" value="rdf" checked>RDF</label></li>