diff --git a/demo/XidDemo.java b/demo/XidDemo.java
index 9ad1b98..47bcbf3 100644
--- a/demo/XidDemo.java
+++ b/demo/XidDemo.java
@@ -3,7 +3,7 @@
  */
 
 import fr.devinsy.xidyn.TagDataManager;
-import fr.devinsy.xidyn.TagData;
+import fr.devinsy.xidyn.SimpleTagData;
 import fr.devinsy.xidyn.StringPresenter;
 
 /**
@@ -220,7 +220,7 @@ class XidDemo
 			System.out.println("=>");
 
 			// #05.1
-			data.setIterationStrategy("identities", TagData.IterationStrategy.ONLY_FIRST_ROW);
+			data.setIterationStrategy("identities", SimpleTagData.IterationStrategy.ONLY_FIRST_ROW);
 			System.out.println("ONLY_FIRST_ROW:");
 			StringBuffer html;
 			try
@@ -236,7 +236,7 @@ class XidDemo
 			System.out.println("");
 
 			// #05.2
-			data.setIterationStrategy("identities", TagData.IterationStrategy.ONLY_FIRST_TWO_ROWS);
+			data.setIterationStrategy("identities", SimpleTagData.IterationStrategy.ONLY_FIRST_TWO_ROWS);
 			System.out.println("ONLY_FIRST_TWO_ROWS:");
 			try
 			{
@@ -251,7 +251,7 @@ class XidDemo
 			System.out.println("");
 
 			// #05.3
-			data.setIterationStrategy("identities", TagData.IterationStrategy.ONLY_ROWS_WITH_ID);
+			data.setIterationStrategy("identities", SimpleTagData.IterationStrategy.ONLY_ROWS_WITH_ID);
 			System.out.println("ONLY_ROWS_WITH_ID:");
 			try
 			{
@@ -266,7 +266,7 @@ class XidDemo
 			System.out.println("");
 
 			// #05.4
-			data.setIterationStrategy("identities", TagData.IterationStrategy.ONLY_ROWS_WITHOUT_ID);
+			data.setIterationStrategy("identities", SimpleTagData.IterationStrategy.ONLY_ROWS_WITHOUT_ID);
 			System.out.println("ONLY_ROWS_WITHOUT_ID:");
 			try
 			{
@@ -281,7 +281,7 @@ class XidDemo
 			System.out.println("");
 
 			// #05.5
-			data.setIterationStrategy("identities", TagData.IterationStrategy.ALL_ROWS);
+			data.setIterationStrategy("identities", SimpleTagData.IterationStrategy.ALL_ROWS);
 			System.out.println("ALL_ROWS:");
 			try
 			{
diff --git a/src/fr/devinsy/xidyn/Presenter.java b/src/fr/devinsy/xidyn/Presenter.java
index df2c94f..5cd843a 100644
--- a/src/fr/devinsy/xidyn/Presenter.java
+++ b/src/fr/devinsy/xidyn/Presenter.java
@@ -672,12 +672,12 @@ public class Presenter
 	static protected void processChildren(final Writer result, final Node node, final TagsDataById datas, final String suffix) throws Exception
 	{
 		// Get the iteration strategy.
-		TagData.IterationStrategy strategy;
+		SimpleTagData.IterationStrategy strategy;
 
 		NamedNodeMap attributes = node.getAttributes();
 		if (attributes == null)
 		{
-			strategy = TagData.IterationStrategy.ALL_ROWS;
+			strategy = SimpleTagData.IterationStrategy.ALL_ROWS;
 		}
 		else
 		{
@@ -685,23 +685,23 @@ public class Presenter
 
 			if (id == null)
 			{
-				strategy = TagData.IterationStrategy.ALL_ROWS;
+				strategy = SimpleTagData.IterationStrategy.ALL_ROWS;
 			}
 			else
 			{
-				TagDataCore dataCore = datas.getId(id.getNodeValue());
+				TagData dataCore = datas.getId(id.getNodeValue());
 				if (dataCore == null)
 				{
-					strategy = TagData.IterationStrategy.ALL_ROWS;
+					strategy = SimpleTagData.IterationStrategy.ALL_ROWS;
 				}
-				else if (dataCore instanceof TagData)
+				else if (dataCore instanceof SimpleTagData)
 				{
-					TagData data = (TagData) dataCore;
+					SimpleTagData data = (SimpleTagData) dataCore;
 					strategy = data.iterationStrategy();
 				}
 				else
 				{
-					strategy = TagData.IterationStrategy.ALL_ROWS;
+					strategy = SimpleTagData.IterationStrategy.ALL_ROWS;
 				}
 			}
 		}
@@ -877,15 +877,15 @@ public class Presenter
 		logger.debug("tag=" + tag);
 
 		// Get data of this id.
-		TagDataCore dataCore = datas.get(idAttr.getNodeValue());
+		TagData dataCore = datas.get(idAttr.getNodeValue());
 
 		if (dataCore == null)
 		{
 			Presenter.processElementBasically(result, node, datas, suffix);
 		}
-		else if (dataCore instanceof TagData)
+		else if (dataCore instanceof SimpleTagData)
 		{
-			TagData data = (TagData) dataCore;
+			SimpleTagData data = (SimpleTagData) dataCore;
 
 			String theClass = data.attributes().getAttribute("class");
 
@@ -933,9 +933,9 @@ public class Presenter
 			int nbLines = tags.size();
 			for (int nLine = 0; nLine < nbLines; nLine++)
 			{
-				if (tags.elementAt(nLine) instanceof TagData)
+				if (tags.elementAt(nLine) instanceof SimpleTagData)
 				{
-					TagData data = (TagData) tags.elementAt(nLine);
+					SimpleTagData data = (SimpleTagData) tags.elementAt(nLine);
 
 					// Open the tag.
 					result.append("<");
diff --git a/src/fr/devinsy/xidyn/SimpleTagData.java b/src/fr/devinsy/xidyn/SimpleTagData.java
new file mode 100644
index 0000000..6d549c2
--- /dev/null
+++ b/src/fr/devinsy/xidyn/SimpleTagData.java
@@ -0,0 +1,176 @@
+package fr.devinsy.xidyn;
+
+import java.io.Serializable;
+
+/**
+ * IdData class is used to hold application data and the business logic that
+ * operates on the data.
+ * 
+ * The only requirement of a IdData class is that it must implement a display
+ * method. The display method must return a text representation of the data,
+ * suitable for display in a web page.
+ * 
+ * XID provides a User Input IdData, Text IdData and ... application may also
+ * implement it's own IdData classes.
+ * 
+ */
+public class SimpleTagData implements Serializable, TagData
+{
+	public enum IterationStrategy
+	{
+		ONLY_FIRST_ROW, ONLY_FIRST_TWO_ROWS, ONLY_ROWS_WITH_ID, ONLY_ROWS_WITHOUT_ID, ALL_ROWS
+	}
+
+	public enum MODE
+	{
+		REPLACE, APPEND, IGNORE
+	}
+
+	private static final long serialVersionUID = 8976245034682639923L;;
+
+	private IterationStrategy iterationStrategy;
+	private TagAttributes attributes;
+	private boolean excludeSection;
+	private MODE displayMode = MODE.REPLACE;
+	private String content;
+
+	/**
+	 *
+	 */
+	public SimpleTagData()
+	{
+		this.attributes = null;
+		this.excludeSection = false;
+		this.displayMode = MODE.REPLACE;
+		this.content = null;
+		this.iterationStrategy = IterationStrategy.ALL_ROWS;
+	}
+
+	/**
+	 *
+	 */
+	public SimpleTagData(final String text)
+	{
+		this.attributes = null;
+		this.excludeSection = false;
+		this.displayMode = MODE.REPLACE;
+		this.content = text;
+		this.iterationStrategy = IterationStrategy.ALL_ROWS;
+	}
+
+	/**
+	 *
+	 */
+	public void appendContent(final String text)
+	{
+		if (this.content == null)
+		{
+			this.content = text;
+		}
+		else
+		{
+			this.content += text;
+		}
+	}
+
+	/**
+	 *
+	 */
+	public TagAttributes attributes()
+	{
+		TagAttributes result;
+
+		if (this.attributes == null)
+		{
+			this.attributes = new TagAttributes();
+		}
+
+		result = this.attributes;
+
+		//
+		return (result);
+	}
+
+	/**
+	 *
+	 */
+	public String display()
+	{
+		String result;
+
+		result = this.content;
+
+		//
+		return (result);
+	}
+
+	/**
+	 *
+	 */
+	public MODE displayMode()
+	{
+		MODE result;
+
+		result = this.displayMode;
+
+		return (result);
+	}
+
+	/**
+	 *
+	 */
+	public boolean excludeSection()
+	{
+		boolean result;
+
+		result = excludeSection;
+
+		//
+		return (result);
+	}
+
+	/**
+	 *
+	 */
+	public IterationStrategy iterationStrategy()
+	{
+		IterationStrategy result;
+
+		result = this.iterationStrategy;
+
+		//
+		return (result);
+	}
+
+	/**
+	 *
+	 */
+	public void setContent(final String text)
+	{
+		this.content = text;
+	}
+
+	/**
+	 *
+	 */
+	public void setDisplayMode(final MODE displayMode)
+	{
+		this.displayMode = displayMode;
+	}
+
+	/**
+	 *
+	 */
+	public void setExcludeSection(final boolean excludeSection)
+	{
+		this.excludeSection = excludeSection;
+	}
+
+	/**
+	 *
+	 */
+	public void setIterationStrategy(final IterationStrategy strategy)
+	{
+		this.iterationStrategy = strategy;
+	}
+}
diff --git a/src/fr/devinsy/xidyn/TagData.java b/src/fr/devinsy/xidyn/TagData.java
index 47a05fd..df7c3cb 100644
--- a/src/fr/devinsy/xidyn/TagData.java
+++ b/src/fr/devinsy/xidyn/TagData.java
@@ -1,176 +1,15 @@
 package fr.devinsy.xidyn;
 
-import java.io.Serializable;
-
-/**
- * IdData class is used to hold application data and the business logic that
- * operates on the data.
- * 
- * The only requirement of a IdData class is that it must implement a display
- * method. The display method must return a text representation of the data,
- * suitable for display in a web page.
- * 
- * XID provides a User Input IdData, Text IdData and ... application may also
- * implement it's own IdData classes.
- * 
+/*
+ * Xid uses three class to describe data:
+ * - TagData
+ * - TagsData
+ * - TagsDataById
+ * Others class that doesn't extends these won't be use by Xid.
+ *
+ * This interface helps to express this fact.
+ *
  */
-public class TagData implements Serializable, TagDataCore
+public interface TagData
 {
-	public enum IterationStrategy
-	{
-		ONLY_FIRST_ROW, ONLY_FIRST_TWO_ROWS, ONLY_ROWS_WITH_ID, ONLY_ROWS_WITHOUT_ID, ALL_ROWS
-	}
-
-	public enum MODE
-	{
-		REPLACE, APPEND, IGNORE
-	}
-
-	private static final long serialVersionUID = 8976245034682639923L;;
-
-	private IterationStrategy iterationStrategy;
-	private TagAttributes attributes;
-	private boolean excludeSection;
-	private MODE displayMode = MODE.REPLACE;
-	private String content;
-
-	/**
-	 *
-	 */
-	public TagData()
-	{
-		this.attributes = null;
-		this.excludeSection = false;
-		this.displayMode = MODE.REPLACE;
-		this.content = null;
-		this.iterationStrategy = IterationStrategy.ALL_ROWS;
-	}
-
-	/**
-	 *
-	 */
-	public TagData(final String text)
-	{
-		this.attributes = null;
-		this.excludeSection = false;
-		this.displayMode = MODE.REPLACE;
-		this.content = text;
-		this.iterationStrategy = IterationStrategy.ALL_ROWS;
-	}
-
-	/**
-	 *
-	 */
-	public void appendContent(final String text)
-	{
-		if (this.content == null)
-		{
-			this.content = text;
-		}
-		else
-		{
-			this.content += text;
-		}
-	}
-
-	/**
-	 *
-	 */
-	public TagAttributes attributes()
-	{
-		TagAttributes result;
-
-		if (this.attributes == null)
-		{
-			this.attributes = new TagAttributes();
-		}
-
-		result = this.attributes;
-
-		//
-		return (result);
-	}
-
-	/**
-	 *
-	 */
-	public String display()
-	{
-		String result;
-
-		result = this.content;
-
-		//
-		return (result);
-	}
-
-	/**
-	 *
-	 */
-	public MODE displayMode()
-	{
-		MODE result;
-
-		result = this.displayMode;
-
-		return (result);
-	}
-
-	/**
-	 *
-	 */
-	public boolean excludeSection()
-	{
-		boolean result;
-
-		result = excludeSection;
-
-		//
-		return (result);
-	}
-
-	/**
-	 *
-	 */
-	public IterationStrategy iterationStrategy()
-	{
-		IterationStrategy result;
-
-		result = this.iterationStrategy;
-
-		//
-		return (result);
-	}
-
-	/**
-	 *
-	 */
-	public void setContent(final String text)
-	{
-		this.content = text;
-	}
-
-	/**
-	 *
-	 */
-	public void setDisplayMode(final MODE displayMode)
-	{
-		this.displayMode = displayMode;
-	}
-
-	/**
-	 *
-	 */
-	public void setExcludeSection(final boolean excludeSection)
-	{
-		this.excludeSection = excludeSection;
-	}
-
-	/**
-	 *
-	 */
-	public void setIterationStrategy(final IterationStrategy strategy)
-	{
-		this.iterationStrategy = strategy;
-	}
 }
diff --git a/src/fr/devinsy/xidyn/TagDataCore.java b/src/fr/devinsy/xidyn/TagDataCore.java
deleted file mode 100644
index 60b44e0..0000000
--- a/src/fr/devinsy/xidyn/TagDataCore.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package fr.devinsy.xidyn;
-
-/*
- * Xid uses three class to describe data:
- * - TagData
- * - TagsData
- * - TagsDataById
- * Others class that doesn't extends these won't be use by Xid.
- *
- * This interface helps to express this fact.
- *
- */
-public interface TagDataCore
-{
-}
diff --git a/src/fr/devinsy/xidyn/TagDataManager.java b/src/fr/devinsy/xidyn/TagDataManager.java
index 2795eb0..2e7989e 100644
--- a/src/fr/devinsy/xidyn/TagDataManager.java
+++ b/src/fr/devinsy/xidyn/TagDataManager.java
@@ -20,7 +20,7 @@ public class TagDataManager
 	 */
 	public void appendAttribute(final String id, final int line, final String column, final String label, final String value)
 	{
-		TagData tag = this.getIdData(id, line, column);
+		SimpleTagData tag = this.getIdData(id, line, column);
 
 		tag.attributes().appendAttribute(label, value);
 	}
@@ -38,7 +38,7 @@ public class TagDataManager
 	 */
 	public void appendAttribute(final String id, final String label, final String value)
 	{
-		TagData tag = this.getIdData(id);
+		SimpleTagData tag = this.getIdData(id);
 
 		tag.attributes().appendAttribute(label, value);
 	}
@@ -56,7 +56,7 @@ public class TagDataManager
 	 */
 	public void appendContent(final String id, final int line, final String value)
 	{
-		TagData tag = this.getIdData(id, line);
+		SimpleTagData tag = this.getIdData(id, line);
 
 		tag.appendContent(value);
 	}
@@ -74,7 +74,7 @@ public class TagDataManager
 	 */
 	public void appendContent(final String id, final int line, final String column, final String value)
 	{
-		TagData tag = this.getIdData(id, line, column);
+		SimpleTagData tag = this.getIdData(id, line, column);
 
 		tag.appendContent(value);
 	}
@@ -82,18 +82,18 @@ public class TagDataManager
 	/**
 	 *
 	 */
-	public TagData getIdData(final String id)
+	public SimpleTagData getIdData(final String id)
 	{
-		TagData result;
+		SimpleTagData result;
 
 		// Be sure that IdData is existing and get item.
-		result = (TagData) this.idsDataById.getId(id);
+		result = (SimpleTagData) this.idsDataById.getId(id);
 
 		if (result == null)
 		{
-			this.idsDataById.setId(id, new TagData());
+			this.idsDataById.setId(id, new SimpleTagData());
 
-			result = (TagData) this.idsDataById.getId(id);
+			result = (SimpleTagData) this.idsDataById.getId(id);
 		}
 
 		//
@@ -103,9 +103,9 @@ public class TagDataManager
 	/**
 	 *
 	 */
-	public TagData getIdData(final String id, final int line)
+	public SimpleTagData getIdData(final String id, final int line)
 	{
-		TagData result;
+		SimpleTagData result;
 
 		// Be sure that IdsData are existing.
 		TagsDataByIndex tags = (TagsDataByIndex) this.idsDataById.getId(id);
@@ -120,11 +120,11 @@ public class TagDataManager
 		int nbLines = tags.size();
 		for (int nLine = nbLines; nLine < line + 1; nLine++)
 		{
-			tags.add(nLine, new TagData());
+			tags.add(nLine, new SimpleTagData());
 		}
 
 		// Get item.
-		result = (TagData) tags.elementAt(line);
+		result = (SimpleTagData) tags.elementAt(line);
 
 		//
 		return (result);
@@ -133,9 +133,9 @@ public class TagDataManager
 	/**
 	 *
 	 */
-	public TagData getIdData(final String id, final int line, final String column)
+	public SimpleTagData getIdData(final String id, final int line, final String column)
 	{
-		TagData result;
+		SimpleTagData result;
 
 		// Be sure that IdsData are existing.
 		TagsDataByIndex tags = (TagsDataByIndex) this.idsDataById.getId(id);
@@ -156,13 +156,13 @@ public class TagDataManager
 		// Get item.
 		TagsDataById lineData = (TagsDataById) tags.elementAt(line);
 
-		result = (TagData) lineData.get(column);
+		result = (SimpleTagData) lineData.get(column);
 
 		if (result == null)
 		{
-			lineData.put(column, new TagData());
+			lineData.put(column, new SimpleTagData());
 
-			result = (TagData) lineData.get(column);
+			result = (SimpleTagData) lineData.get(column);
 		}
 
 		//
@@ -195,7 +195,7 @@ public class TagDataManager
 	 */
 	public void setAttribute(final String id, final int line, final String label, final String value)
 	{
-		TagData tag = this.getIdData(id, line);
+		SimpleTagData tag = this.getIdData(id, line);
 
 		tag.attributes().setAttribute(label, value);
 	}
@@ -213,7 +213,7 @@ public class TagDataManager
 	 */
 	public void setAttribute(final String id, final int line, final String column, final String label, final String value)
 	{
-		TagData tag = this.getIdData(id, line, column);
+		SimpleTagData tag = this.getIdData(id, line, column);
 
 		tag.attributes().setAttribute(label, value);
 	}
@@ -231,7 +231,7 @@ public class TagDataManager
 	 */
 	public void setAttribute(final String id, final String label, final String value)
 	{
-		TagData tag = this.getIdData(id);
+		SimpleTagData tag = this.getIdData(id);
 
 		tag.attributes().setAttribute(label, value);
 	}
@@ -257,7 +257,7 @@ public class TagDataManager
 	 */
 	public void setContent(final String id, final int line, final String content)
 	{
-		TagData tag = this.getIdData(id, line);
+		SimpleTagData tag = this.getIdData(id, line);
 
 		tag.setContent(content);
 	}
@@ -285,7 +285,7 @@ public class TagDataManager
 	 */
 	public void setContent(final String id, final int line, final String column, final String content)
 	{
-		TagData tag = this.getIdData(id, line, column);
+		SimpleTagData tag = this.getIdData(id, line, column);
 
 		tag.setContent(content);
 	}
@@ -295,7 +295,7 @@ public class TagDataManager
 	 */
 	public void setContent(final String id, final String content)
 	{
-		TagData idData = this.getIdData(id);
+		SimpleTagData idData = this.getIdData(id);
 
 		idData.setContent(content);
 	}
@@ -303,9 +303,9 @@ public class TagDataManager
 	/**
 	 *
 	 */
-	public void setIterationStrategy(final String id, final TagData.IterationStrategy strategy)
+	public void setIterationStrategy(final String id, final SimpleTagData.IterationStrategy strategy)
 	{
-		TagData tag = this.getIdData(id);
+		SimpleTagData tag = this.getIdData(id);
 
 		tag.setIterationStrategy(strategy);
 	}
diff --git a/src/fr/devinsy/xidyn/TagsDataById.java b/src/fr/devinsy/xidyn/TagsDataById.java
index ad1e572..d09f1cf 100644
--- a/src/fr/devinsy/xidyn/TagsDataById.java
+++ b/src/fr/devinsy/xidyn/TagsDataById.java
@@ -5,7 +5,7 @@ import java.util.HashMap;
 /**
  *
  */
-public class TagsDataById extends HashMap<String, TagDataCore> implements TagDataCore
+public class TagsDataById extends HashMap<String, TagData> implements TagData
 {
 
 	private static final long serialVersionUID = -5787252043825503554L;
@@ -21,9 +21,9 @@ public class TagsDataById extends HashMap<String, TagDataCore> implements TagDat
 	/**
 	 *
 	 */
-	public TagDataCore getId(final String id)
+	public TagData getId(final String id)
 	{
-		TagDataCore result;
+		TagData result;
 
 		result = this.get(id);
 
@@ -34,7 +34,7 @@ public class TagsDataById extends HashMap<String, TagDataCore> implements TagDat
 	/**
 	 *
 	 */
-	public void setId(final String id, final TagDataCore data)
+	public void setId(final String id, final TagData data)
 	{
 		this.put(id, data);
 	}
diff --git a/src/fr/devinsy/xidyn/TagsDataByIndex.java b/src/fr/devinsy/xidyn/TagsDataByIndex.java
index 6c0ef9d..0802b58 100644
--- a/src/fr/devinsy/xidyn/TagsDataByIndex.java
+++ b/src/fr/devinsy/xidyn/TagsDataByIndex.java
@@ -5,7 +5,7 @@ import java.util.Vector;
 /**
  *
  */
-public class TagsDataByIndex extends Vector<TagDataCore> implements TagDataCore
+public class TagsDataByIndex extends Vector<TagData> implements TagData
 {
 
 	private static final long serialVersionUID = 215545720925753884L;
diff --git a/test/XidTest.java b/test/XidTest.java
index 6485ac1..9675ecd 100644
--- a/test/XidTest.java
+++ b/test/XidTest.java
@@ -3,7 +3,7 @@
  */
 
 import fr.devinsy.xidyn.TagDataManager;
-import fr.devinsy.xidyn.TagData;
+import fr.devinsy.xidyn.SimpleTagData;
 import fr.devinsy.xidyn.StringPresenter;
 
 /**
@@ -55,7 +55,7 @@ class XidTest
 		System.out.println("Automatic test action for Xid!");
 
 		TagDataManager datas;
-		TagData tag;
+		SimpleTagData tag;
 
 		String htmlSource;
 		StringBuffer html;