diff --git a/src/fr/devinsy/xidyn/presenters/FilePresenter.java b/src/fr/devinsy/xidyn/presenters/FilePresenter.java
index 5d6fcad..492fa27 100644
--- a/src/fr/devinsy/xidyn/presenters/FilePresenter.java
+++ b/src/fr/devinsy/xidyn/presenters/FilePresenter.java
@@ -53,7 +53,11 @@ public class FilePresenter extends StringPresenter
 	{
 		StringBuffer result;
 
-		result = dynamize((TagDataManager) null);
+		//
+		update();
+
+		//
+		result = dynamize();
 
 		//
 		return result;
@@ -72,29 +76,7 @@ public class FilePresenter extends StringPresenter
 		logger.info("dynamize file [" + this.sourceFilePathname + "]");
 
 		//
-		if (this.source == null)
-		{
-			String errorMessage = "source not defined";
-			logger.error(errorMessage);
-			result = null;
-			throw new Exception(errorMessage);
-		}
-		else if (!source.exists())
-		{
-			String errorMessage = "source file defined but not found (" + this.sourceFilePathname + ")";
-			logger.error(errorMessage);
-			result = null;
-			throw new Exception(errorMessage);
-		}
-		else
-		{
-			long currentTime = this.source.lastModified();
-			if ((super.getSource() == null) || (this.sourceTime != currentTime))
-			{
-				super.setSource(XidynUtils.load(this.source));
-				this.sourceTime = currentTime;
-			}
-		}
+		update();
 
 		// Build the web page.
 		result = super.dynamize(data);
@@ -212,6 +194,35 @@ public class FilePresenter extends StringPresenter
 		setSource(file);
 	}
 
+	/**
+	 * @throws Exception
+	 */
+	public void update() throws Exception
+	{
+		//
+		if (this.source == null)
+		{
+			String errorMessage = "source not defined";
+			logger.error(errorMessage);
+			throw new NullPointerException(errorMessage);
+		}
+		else if (!source.exists())
+		{
+			String errorMessage = "source file defined but not found (" + this.sourceFilePathname + ")";
+			logger.error(errorMessage);
+			throw new Exception(errorMessage);
+		}
+		else
+		{
+			long currentTime = this.source.lastModified();
+			if ((super.getSource() == null) || (this.sourceTime != currentTime))
+			{
+				super.setSource(XidynUtils.load(this.source));
+				this.sourceTime = currentTime;
+			}
+		}
+	}
+
 	/**
 	 * Dynamize a file without data.
 	 */
diff --git a/src/fr/devinsy/xidyn/presenters/URLPresenter.java b/src/fr/devinsy/xidyn/presenters/URLPresenter.java
index 0ddbd21..458b04f 100644
--- a/src/fr/devinsy/xidyn/presenters/URLPresenter.java
+++ b/src/fr/devinsy/xidyn/presenters/URLPresenter.java
@@ -56,7 +56,11 @@ public class URLPresenter extends StringPresenter
 	{
 		StringBuffer result;
 
-		result = dynamize((TagDataManager) null);
+		//
+		update();
+
+		//
+		result = super.dynamize();
 
 		//
 		return result;
@@ -73,24 +77,10 @@ public class URLPresenter extends StringPresenter
 		logger.info("dynamize URL [" + this.sourcePathname + "]");
 
 		//
-		if (this.source == null)
-		{
-			String errorMessage = "source not defined";
-			logger.error(errorMessage);
-			throw new NullPointerException(errorMessage);
-		}
-		else
-		{
-			long currentSourceTime = this.source.openConnection().getLastModified();
-			if ((super.getSource() == null) || (this.sourceTime != currentSourceTime))
-			{
-				super.setSource(XidynUtils.load(this.source));
-				this.sourceTime = currentSourceTime;
-			}
+		update();
 
-			// Build the web page.
-			result = super.dynamize(data);
-		}
+		// Build the web page.
+		result = super.dynamize(data);
 
 		//
 		return (result);
@@ -194,6 +184,56 @@ public class URLPresenter extends StringPresenter
 		}
 	}
 
+	/**
+	 * 
+	 */
+	@Override
+	public String toString()
+	{
+		String result;
+
+		try
+		{
+			//
+			update();
+
+			//
+			result = super.getSource();
+		}
+		catch (final IOException exception)
+		{
+			result = null;
+		}
+
+		//
+		return result;
+	}
+
+	/**
+	 * No need to be synchronized.
+	 * 
+	 * @throws IOException
+	 */
+	public void update() throws IOException
+	{
+		//
+		if (this.source == null)
+		{
+			String errorMessage = "source not defined";
+			logger.error(errorMessage);
+			throw new NullPointerException(errorMessage);
+		}
+		else
+		{
+			long currentSourceTime = this.source.openConnection().getLastModified();
+			if ((super.getSource() == null) || (this.sourceTime != currentSourceTime))
+			{
+				super.setSource(XidynUtils.load(this.source));
+				this.sourceTime = currentSourceTime;
+			}
+		}
+	}
+
 	/**
 	 * Dynamize a file without data.
 	 */