Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* Replaces the old config variable with the new one.
	 * 
	 * @param oldVar
	 *            the old config variable
	 * @param newVar
	 *            the new config variable
	 * @throws SemanticException
	 *             if the old config variable is not found or the name of new
	 *             one is empty.
	 * 
	 */
	public void replaceConfigVariable( ConfigVariable oldVar,
			ConfigVariable newVar ) throws SemanticException
	{
		replaceObjectInList( CONFIG_VARS_PROP, oldVar, newVar );
	}
	/**
	 * Replaces the old embedded image with the new one.
	 * 
	 * @param oldVar
	 *            the old embedded image
	 * @param newVar
	 *            the new embedded image
	 * @throws SemanticException
	 *             if the old image is not found or the name of new one is
	 *             empty.
	 */
	public void replaceImage( EmbeddedImage oldVar, EmbeddedImage newVar )
			throws SemanticException
	{