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
*/
	public List getVisibleDataSets( )
	{
		IModuleNameSpace namescope = module
				.getModuleNameSpace( Module.DATA_SET_NAME_SPACE );
		List elementList = namescope
				.getElements( IModuleNameSpace.NATIVE_LEVEL );
		return generateHandleList( elementList );
	}
	/**
	 * Returns all page handles that this modules and the included modules
	 * contain.
	 * 
	 * @return all page handles that this modules and the included modules
	 *         contain.
	 */
	public List getAllPages( )
	{
		List elementList = module.getNameSpace( Module.PAGE_NAME_SPACE )
				.getElements( );
		return generateHandleList( elementList );
	}
	/**
	 * Returns all parameter handles that this modules and the included modules
	 * contain.
	 * 
	 * @return all parameter handles that this modules and the included modules
	 *         contain.
	 */
	public List getAllParameters( )