diff --git a/demo/XidDemo.java b/demo/XidDemo.java
index ab72782..c514389 100644
--- a/demo/XidDemo.java
+++ b/demo/XidDemo.java
@@ -31,8 +31,6 @@ class XidDemo
 	
 	//
 	Data datas;
-	IdData tag;
-	
 	
 	
 	
diff --git a/test/XidTest.java b/test/XidTest.java
index 18361e8..d005008 100644
--- a/test/XidTest.java
+++ b/test/XidTest.java
@@ -60,15 +60,20 @@ class XidTest
 
 		String htmlSource;
 		StringBuffer html;
-		StringBuffer errorMessage;
 
 		// Populate attributes of Test 03.
 		System.out.println ("----------------------------");
 		datas = new Data ();
 		datas.setContent ("name", "Superman");
-		errorMessage = new StringBuffer ();
-
-		html = StringPresenter.doXid ("<div id='name'>a name</div >", datas, errorMessage);
+	    try
+	    {
+	    	html = StringPresenter.doXid ("<div id='name'>a name</div >", datas);
+	    }
+	    catch (Exception exception)
+	    {
+	    	System.out.println(exception.getMessage());
+	    	html = null;
+	    }
 
 		System.out.println (check ("only content change", html, "<div id=\"name\">Superman</div>"));
 
@@ -81,8 +86,15 @@ class XidTest
 		datas.appendAttribute ("lastname", "style", "foreground: red;");
 		datas.setAttribute ("lastname", "class", "nameClass");
 
-		errorMessage = new StringBuffer ();
-		html = StringPresenter.doXid ("<div id='lastname'>a last name</div >", datas, errorMessage);
+	    try
+	    {
+		html = StringPresenter.doXid ("<div id='lastname'>a last name</div >", datas);
+	    }
+	    catch (Exception exception)
+	    {
+	    	System.out.println(exception.getMessage());
+	    	html = null;
+	    }
 		System.out.println (check ("content and attributes", html, "<div id=\"lastname\" style=\"background: blue;foreground: red;\" class=\"nameClass\">Spiderman</div>"));
 
 		// Populate attributes of Test 03.
@@ -95,9 +107,15 @@ class XidTest
 		datas.setContent ("words", 4, "echo");
 		datas.setContent ("words", 5, "fox");
 
-
-		errorMessage = new StringBuffer ();
-		html = StringPresenter.doXid ("<ul>\n  <li id='words'>a word</li>\n</ul>", datas, errorMessage);
+	    try
+	    {
+		html = StringPresenter.doXid ("<ul>\n  <li id='words'>a word</li>\n</ul>", datas);
+	    }
+	    catch (Exception exception)
+	    {
+	    	System.out.println(exception.getMessage());
+	    	html = null;
+	    }
 
 		System.out.println (check ("list assertion 1", html, "<li id=\"words_0\">alpha</li>"));
 		System.out.println (check ("list assertion 2", html, "<li id=\"words_1\">bravo</li>"));
@@ -116,14 +134,20 @@ class XidTest
 		datas.setContent ("identity", 2, "nom", "Tronche");
 		datas.setContent ("identity", 2, "prenom", "Christophe");
 
-
-		errorMessage = new StringBuffer ();
 		StringBuffer source = new StringBuffer ();
 		source.append ("<table>\n");
 		source.append (" <tr id='identity'><td>noid</td><td id='nom'>un nom</td><td id='prenom'>un prenom</td></tr>\n");
 		source.append ("</table>");
 		htmlSource = source.toString ();
-		html = StringPresenter.doXid (htmlSource, datas, errorMessage);
+	    try
+	    {
+		html = StringPresenter.doXid (htmlSource, datas);
+	    }
+	    catch (Exception exception)
+	    {
+	    	System.out.println(exception.getMessage());
+	    	html = null;
+	    }
 
 		System.out.println (check ("table 1 assertion 1", html, "<tr id=\"identity_0\"><td>noid</td><td id=\"nom_0\">Jemba</td><td id=\"prenom_0\">Epo</td></tr>"));
 		System.out.println (check ("table 1 assertion 2", html, "<tr id=\"identity_1\"><td>noid</td><td id=\"nom_1\">Momon</td><td id=\"prenom_1\">Christian</td></tr>"));