can add personal function

tests/dictionaries/80empty_param_number/00_base.xml

@@ -0,0 +1,21 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<rougail>
+    <services/>
+
+    <variables>
+        <family name="proxy authentifié">
+            <variable name="toto1" type="port" description="Port d'écoute du proxy" mode="expert">
+            </variable>
+            <variable name="toto2" type="port" description="Port d'écoute du proxy NTLM" mode="expert">
+                <value>3127</value>
+            </variable>
+        </family>
+    </variables>
+
+    <constraints>
+        <fill name="calc_multi_condition" target="toto1">
+	    <param name="value" type="number"/>
+        </fill>
+    </constraints>
+
+</rougail>