Bug 136279 Structure and table datatypes should be hidden.
Description: Structure and table datatype should be hidden. Steps to reproduce: In table data binding, I saw structure and table two datatypes. They are not supported now, so they should be removed.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
*         or save; <code>false</code> if it has not changed.
	 */
	public boolean needsSave( )
	{
		return module.isDirty( );
	}
	/**
	 * Calls to inform a save is successful. Must be called after a successful
	 * completion of a save done using <code>serialize</code>.
	 */
	public void onSave( )
	{
		module.onSave( );
	}
	/**
	 * Removes a given validation listener. If the listener not registered, then
	 * the request is silently ignored.
	 * 
	 * @param listener
	 *            the listener to de-register
	 * @return <code>true</code> if <code>listener</code> is sucessfully
	 *         removed. Otherwise <code>false</code>.
	 */
	public boolean removeValidationListener( IValidationListener listener )
	{
		return getModule( ).removeValidationListener( listener );
	}
	/**
	 * Checks the element name in name space of this report.
	 *