diff --git a/demo/XidynDemo.java b/demo/XidynDemo.java
index 60676be..24efb65 100644
--- a/demo/XidynDemo.java
+++ b/demo/XidynDemo.java
@@ -20,6 +20,7 @@ import org.apache.log4j.Level;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import fr.devinsy.util.strings.StringList;
 import fr.devinsy.xidyn.data.SimpleTagData;
 import fr.devinsy.xidyn.data.TagDataManager;
 import fr.devinsy.xidyn.presenters.PresenterUtils;
@@ -51,153 +52,161 @@ class XidynDemo
 
         // Step #01.
         {
-            System.out.println("----------------------------");
-
-            // Populate attributes.
-            data = new TagDataManager();
-            data.setContent("name", "Superman");
-
-            String htmlSource = "<div id='name'>a name</div >";
-            StringBuffer htmlTarget;
             try
             {
-                htmlTarget = PresenterUtils.dynamize(htmlSource, data);
+                System.out.println("----------------------------");
+
+                String htmlSource = "<div id='pseudo'>a pseudo</div >";
+
+                data = new TagDataManager();
+                data.setContent("name", "Superman");
+
+                String htmlTarget = PresenterUtils.dynamize(htmlSource, data).toString();
+
+                System.out.println("datas = new Data ();");
+                System.out.println("datas.setContent (\"pseudo\", \"Superman\");");
+                System.out.println("+");
+                System.out.println("<div id='pseudo'>a pseudo</div >");
+                System.out.println("=>");
+                System.out.println(htmlTarget);
+                System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
             }
             catch (Exception exception)
             {
                 System.out.println(exception.getMessage());
-                htmlTarget = null;
             }
-            System.out.println("datas = new Data ();");
-            System.out.println("datas.setContent (\"name\", \"Superman\");");
-            System.out.println("+");
-            System.out.println("<div id='name'>a name</div >");
-            System.out.println("=>");
-            System.out.println(htmlTarget);
-            System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
         }
 
         // Step #02.
         {
-            System.out.println("----------------------------");
-            // Populate attributes.
-            data = new TagDataManager();
-            data.setContent("lastname", "Spiderman");
-            data.appendAttribute("lastname", "style", "background: blue;");
-            data.appendAttribute("lastname", "style", "foreground: red;");
-            data.setAttribute("lastname", "class", "nameClass");
-
-            String htmlSource = "<div id='lastname'>a last name</div >";
-            StringBuffer htmlTarget;
             try
             {
-                htmlTarget = PresenterUtils.dynamize(htmlSource, data);
+                System.out.println("----------------------------");
+
+                String htmlSource = "<div id='lastname'>a last name</div >";
+
+                data = new TagDataManager();
+                data.setContent("pseudo", "Spiderman");
+                data.appendAttribute("pseudo", "style", "background: blue;");
+                data.appendAttribute("pseudo", "style", "foreground: red;");
+                data.setAttribute("pseudo", "class", "nameClass");
+
+                String htmlTarget = PresenterUtils.dynamize(htmlSource, data).toString();
+
+                System.out.println("<div id='lastname'>a last name</div>");
+                System.out.println("+");
+                System.out.println("datas = new Data ();");
+                System.out.println("datas.setContent (\"pseudo\", \"Spiderman\");");
+                System.out.println("datas.appendAttribute (\"pseudo\", \"style\", \"background: blue;\");");
+                System.out.println("datas.appendAttribute (\"pseudo\", \"style\", \"foreground: red;\");");
+                System.out.println("datas.setAttribute (\"pseudo\", \"class\", \"nameClass\");");
+                System.out.println("=>");
+                System.out.println(htmlTarget);
+                System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
             }
             catch (Exception exception)
             {
                 System.out.println(exception.getMessage());
-                htmlTarget = null;
             }
-
-            System.out.println("datas = new Data ();");
-            System.out.println("datas.setContent (\"lastname\", \"Spiderman\");");
-            System.out.println("datas.appendAttribute (\"lastname\", \"style\", \"background: blue;\");");
-            System.out.println("datas.appendAttribute (\"lastname\", \"style\", \"foreground: red;\");");
-            System.out.println("datas.setAttribute (\"lastname\", \"class\", \"nameClass\");");
-            System.out.println("+");
-            System.out.println("<div id='lastname'>a last name</div>");
-            System.out.println("=>");
-            System.out.println(htmlTarget);
-            System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
         }
 
         // Step #03.
         {
             System.out.println("----------------------------");
-            // Populate attributes.
-            data = new TagDataManager();
-            data.setContent("words", 0, "alpha");
-            data.setContent("words", 1, "bravo");
-            data.setContent("words", 2, "charlie");
-            data.setContent("words", 3, "delta");
-            data.setContent("words", 4, "echo");
-            data.setContent("words", 5, "fox");
-
-            String htmlSource = "<ul>\n  <li id='words'>a word</li>\n</ul>";
-            StringBuffer htmlTarget;
             try
             {
-                htmlTarget = PresenterUtils.dynamize(htmlSource, data);
+                StringList source = new StringList();
+                source.appendln("<ul>");
+                source.appendln("  <li id='words'>a word</li>");
+                source.appendln("</ul>");
+                String htmlSource = source.toString();
+
+                // Populate attributes.
+                data = new TagDataManager();
+                data.setContent("words", 0, "alpha");
+                data.setContent("words", 1, "bravo");
+                data.setContent("words", 2, "charlie");
+                data.setContent("words", 3, "delta");
+                data.setContent("words", 4, "echo");
+                data.setContent("words", 5, "fox");
+
+                String htmlTarget = PresenterUtils.dynamize(htmlSource, data).toString();
+
+                System.out.println(htmlSource);
+                System.out.println("+");
+                System.out.println("datas = new Data ();");
+                System.out.println("datas.setContent (\"words\", 0, \"alpha\");");
+                System.out.println("datas.setContent (\"words\", 1, \"bravo\");");
+                System.out.println("datas.setContent (\"words\", 2, \"charlie\");");
+                System.out.println("datas.setContent (\"words\", 3, \"delta\");");
+                System.out.println("datas.setContent (\"words\", 4, \"echo\");");
+                System.out.println("datas.setContent (\"words\", 5, \"fox\");");
+                System.out.println("=>");
+                System.out.println(htmlTarget);
+                System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
             }
             catch (Exception exception)
             {
                 System.out.println(exception.getMessage());
-                htmlTarget = null;
             }
-
-            System.out.println("datas = new Data ();");
-            System.out.println("datas.setContent (\"words\", 0, \"alpha\");");
-            System.out.println("datas.setContent (\"words\", 1, \"bravo\");");
-            System.out.println("datas.setContent (\"words\", 2, \"charlie\");");
-            System.out.println("datas.setContent (\"words\", 3, \"delta\");");
-            System.out.println("datas.setContent (\"words\", 4, \"echo\");");
-            System.out.println("datas.setContent (\"words\", 5, \"fox\");");
-            System.out.println("+");
-            System.out.println("<ul>");
-            System.out.println("  <li id='words'>a word</li>");
-            System.out.println("</ul>");
-            System.out.println("=>");
-            System.out.println(htmlTarget);
-            System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
         }
 
         // Step #04.
         {
-            System.out.println("----------------------------");
-            // Populate attributes.
-            data = new TagDataManager();
-            data.setContent("identity", 0, "last_name", "Jemba");
-            data.setContent("identity", 0, "first_name", "Epo");
-            data.setContent("identity", 1, "last_name", "Momon");
-            data.setContent("identity", 1, "first_name", "Christian");
-            data.setContent("identity", 2, "last_name", "Tronche");
-            data.setContent("identity", 2, "first_name", "Christophe");
-
-            StringBuffer source = new StringBuffer();
-            source.append("<table>\n");
-            source.append("  <tr id='identity'><td>noid</td><td id='first_name'>Jean</td><td id='last_name'>Reve</td></tr>\n");
-            source.append("</table>");
-
-            String htmlSource = source.toString();
-            StringBuffer htmlTarget;
             try
             {
-                htmlTarget = PresenterUtils.dynamize(htmlSource, data);
+                System.out.println("----------------------------");
+
+                StringBuffer source = new StringBuffer();
+                source.append("<table>\n");
+                source.append("  <tr id='identity'><td>noid</td><td id='first_name'>Jean</td><td id='last_name'>Reve</td></tr>\n");
+                source.append("</table>");
+                String htmlSource = source.toString();
+
+                // Populate attributes.
+                data = new TagDataManager();
+                data.setContent("identity", 0, "last_name", "Jemba");
+                data.setContent("identity", 0, "first_name", "Epo");
+                data.setContent("identity", 1, "last_name", "Momon");
+                data.setContent("identity", 1, "first_name", "Christian");
+                data.setContent("identity", 2, "last_name", "Tronche");
+                data.setContent("identity", 2, "first_name", "Christophe");
+
+                StringBuffer htmlTarget = PresenterUtils.dynamize(htmlSource, data);
+
+                System.out.println(htmlSource);
+                System.out.println("+");
+                System.out.println("datas = new Data ();");
+                System.out.println("datas.setContent (\"identity\", 0, \"last_name\", \"Jemba\");");
+                System.out.println("datas.setContent (\"identity\", 0, \"first_name\", \"Epo\");");
+                System.out.println("datas.setContent (\"identity\", 1, \"last_name\", \"Momon\");");
+                System.out.println("datas.setContent (\"identity\", 1, \"first_name\", \"Christian\");");
+                System.out.println("datas.setContent (\"identity\", 2, \"last_name\", \"Tronche\");");
+                System.out.println("datas.setContent (\"identity\", 2, \"first_name\", \"Christophe\");");
+                System.out.println("=>");
+                System.out.println(htmlTarget);
+                System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
             }
             catch (Exception exception)
             {
                 System.out.println(exception.getMessage());
-                htmlTarget = null;
             }
-
-            System.out.println("datas = new Data ();");
-            System.out.println("datas.setContent (\"identity\", 0, \"last_name\", \"Jemba\");");
-            System.out.println("datas.setContent (\"identity\", 0, \"first_name\", \"Epo\");");
-            System.out.println("datas.setContent (\"identity\", 1, \"last_name\", \"Momon\");");
-            System.out.println("datas.setContent (\"identity\", 1, \"first_name\", \"Christian\");");
-            System.out.println("datas.setContent (\"identity\", 2, \"last_name\", \"Tronche\");");
-            System.out.println("datas.setContent (\"identity\", 2, \"first_name\", \"Christophe\");");
-
-            System.out.println("+");
-            System.out.println(htmlSource);
-            System.out.println("=>");
-            System.out.println(htmlTarget);
-            System.out.println("[" + htmlSource.length() + "] => [" + htmlTarget.length() + "]");
         }
 
         // Step #05.
         {
             System.out.println("----------------------------");
+
+            //
+            StringBuffer source = new StringBuffer();
+            source.append("<table id=\"identities\">\n");
+            source.append("  <tr id='the_head'><th>noid</th><th>First Name</th><th>Last Name</th></tr>\n");
+            source.append("  <tr id='identity'><td>noid</td><td id='first_name'>Jean</td><td id='last_name'>Reve</td></tr>\n");
+            source.append("  <tr id='identity_bis'><td>noid</td><td id='first_name_bis'>a first name</td><td id='last_name_bis'>a last name</td></tr>\n");
+            source.append("  <tr><td>noid</td><td id='first_name_ter'>a first name more</td><td id='last_name_ter'>a last name more</td></tr>\n");
+            source.append("</table>\n");
+            String htmlSource = source.toString();
+
             // Populate attributes.
             data = new TagDataManager();
             data.setContent("identity", 0, "last_name", "Jemba");
@@ -213,16 +222,8 @@ class XidynDemo
             // datas.setIterationStrategy ("identity",
             // IdsDataByIndex.IterationStrategy.ALL_ROWS);
 
-            //
-            StringBuffer source = new StringBuffer();
-            source.append("<table id=\"identities\">\n");
-            source.append("  <tr id='the_head'><th>noid</th><th>First Name</th><th>Last Name</th></tr>\n");
-            source.append("  <tr id='identity'><td>noid</td><td id='first_name'>Jean</td><td id='last_name'>Reve</td></tr>\n");
-            source.append("  <tr id='identity_bis'><td>noid</td><td id='first_name_bis'>a first name</td><td id='last_name_bis'>a last name</td></tr>\n");
-            source.append("  <tr><td>noid</td><td id='first_name_ter'>a first name more</td><td id='last_name_ter'>a last name more</td></tr>\n");
-            source.append("</table>\n");
-            String htmlSource = source.toString();
-
+            System.out.println(htmlSource);
+            System.out.println("+");
             System.out.println("datas = new Data ();");
             System.out.println("datas.setContent (\"identity\", 0, \"first_name\", \"Epo\");");
             System.out.println("datas.setContent (\"identity\", 0, \"last_name\", \"Jemba\");");
@@ -230,9 +231,6 @@ class XidynDemo
             System.out.println("datas.setContent (\"identity\", 1, \"last_name\", \"Momon\");");
             System.out.println("datas.setContent (\"identity\", 2, \"first_name\", \"Christophe\");");
             System.out.println("datas.setContent (\"identity\", 2, \"last_name\", \"Tronche\");");
-
-            System.out.println("+");
-            System.out.println(htmlSource);
             System.out.println("=>");
 
             // #05.1