Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
* Preprares to save this module. Sets the modification date.
	 */
	public void prepareToSave( )
	{
	}
	/**
	 * Records a successful save.
	 */
	public void onSave( )
	{
		saveState = activityStack.getCurrentTransNo( );
		nameManager.clear( );
	}
	/**
	 * Reports whether the module has changed since it was created, loaded from
	 * disk, or saved, whichever has occurred most recently.
	 * 
	 * @return true if the in-memory version of the module differs from that on
	 *         disk, false if the two representations are the same
	 */
	public boolean isDirty( )
	{
		return saveState != activityStack.getCurrentTransNo( );
	}
	/**
	 * Sets saveState mark.
	 * 
	 * @param saveState
	 *            save state mark
	 */