diff --git a/generic_data/Functions/constants.xml b/generic_data/Functions/constants.xml
index 3ef8e17..4e06465 100755
--- a/generic_data/Functions/constants.xml
+++ b/generic_data/Functions/constants.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<constants>
+<constants xml:id="constants">
   <constant info="astronomical unit" name="AU" units="m" kind="space">1.49598e+11</constant>
   <constant info="Boltzmann constant" name="k" units="J/K" kind="physics">1.38054e-23</constant>
   <constant info="kelvin to electron-volt" name="K2eV" units="eV/K" kind="units">8.622e-5</constant>
diff --git a/generic_data/Functions/functions.xml b/generic_data/Functions/functions.xml
index 049cade..862861d 100644
--- a/generic_data/Functions/functions.xml
+++ b/generic_data/Functions/functions.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<functions>
+<functions xml:id="functions">
   <function name="mean_(,)" args="1" kind="time">
     <prompt>input averaging time in secs</prompt>
     <info_brief>average</info_brief>
@@ -88,11 +88,11 @@
      <prompt/>
      <info_brief>GSE to SM transformation</info_brief>
    </function>-->
-   <function name="cross(,)" params="2" kind="vectors">
+   <function name="cross(,)" args="2" kind="vectors">
      <info_brief>Cross product</info_brief>
      <new_kernel>cross</new_kernel>
    </function>
-   <function name="dot(,)" params="2" kind="vectors">
+   <function name="dot(,)" args="2" kind="vectors">
      <info_brief>Dot product</info_brief>
      <new_kernel>dot</new_kernel>
    </function>
diff --git a/js/app/models/Function.js b/js/app/models/Function.js
index a116196..ad3c865 100644
--- a/js/app/models/Function.js
+++ b/js/app/models/Function.js
@@ -15,9 +15,8 @@ Ext.define('amdaModel.Function', {
 	fields : [
 		{name: 'name', mapping: '@name', type:'string'},
 		{name: 'kind', mapping: '@kind', type: 'string', defaultValue: 'amda'},
-		{name: 'args', mapping: '@args', type: 'int', defaultValue: 0},
+		{name: 'args', mapping: '@args', type: 'int', defaultValue: 1},
 		{name: 'argv', mapping: '@argv', type: 'string'},
-		{name: 'params', mapping: '@params', type:'int', defaultValue: 1},
 		{name: 'prompt', type: 'string', defaultValue: ''},
 		{name: 'info_brief', type: 'string', defaultValue: ''}
 	],
@@ -37,4 +36,4 @@ Ext.define('amdaModel.Function', {
 				record: 'function'
 			}
 	}
-});
\ No newline at end of file
+});
diff --git a/js/app/views/CalculatorUI.js b/js/app/views/CalculatorUI.js
index 687415a..334c9da 100644
--- a/js/app/views/CalculatorUI.js
+++ b/js/app/views/CalculatorUI.js
@@ -189,7 +189,7 @@ Ext.define('amdaUI.CalculatorUI', {
 	
 	processFormula : function(sel,currentBtn, params, afterParamsText){
 		// calculation of the required number of parameters
-		var nbParams = currentBtn.initialConfig.params;
+		var nbParams = currentBtn.initialConfig.args;
 		var fnText = currentBtn.text.split('(');
 		var newConstruction = sel.beforeText + fnText[0]+"(";
 		// if there at least one parameter selected
@@ -210,7 +210,7 @@ Ext.define('amdaUI.CalculatorUI', {
 
 		// If we haven't the right number of selected parameters
 		if (params.length < nbParams){
-			var stringParamRequired = currentBtn.initialConfig.params+" parameter(s)";
+			var stringParamRequired = currentBtn.initialConfig.args+" parameter(s)";
 			Ext.Msg.alert('Caution', 'you\'ll have to add '+ stringParamRequired +' to apply this function', 
 				function(){
 					// set Caret Position at placement of required parameter in function
@@ -446,7 +446,6 @@ Ext.define('amdaUI.CalculatorUI', {
 					{
 						text: f.get('name'),
 						args: f.get('args'),
-						params: f.get('params'),
 						prompt: f.get('prompt'),
 						tooltip: f.get('info_brief'),
 						scope: this,
@@ -466,8 +465,9 @@ Ext.define('amdaUI.CalculatorUI', {
 								Ext.Msg.alert("Invalid Selection", "Action aborted");
 							} 
 							else {
+console.log(params.length);
 								// calculation of the required number of parameters
-								var nbParams = b.initialConfig.params;
+								var nbParams = b.initialConfig.args;
 
 								if (params.length>nbParams)
 								{
--
libgit2 0.21.2