Bug 183918 get relative file path of linkage library
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/library/DesignLoadLibraryTest.java
* 
	 * @throws Exception
	 *             if any exception
	 */
	public void testDesignIncludeLibraries( ) throws Exception
	{
		openDesign( "DesignWithOneCompositeLibrary.xml" ); 
		assertEquals( 3, designHandle.getAllLibraries( ).size( ) );
		
		LibraryHandle libraryComposite = designHandle
				.getLibrary( "CompositeLib" ); 
		LibraryHandle library1 = designHandle.getLibrary( "Lib1" ); 
		LibraryHandle library2 = designHandle.getLibrary( "Lib2" ); 
		assertTrue( libraryComposite.isValid( ) );
		assertNull( library1 );
		assertNull( library2 );
		
		List styleList = designHandle.getAllStyles( );
		assertEquals( 0, styleList.size( ) );
		
		DataSetHandle dataSetHandle1 = libraryComposite
				.findDataSet( "Lib1.dataSet1" ); 
		DataSetHandle dataSetHandle2 = libraryComposite
				.findDataSet( "Lib2.dataSet1" ); 
		assertNotNull( dataSetHandle1 );
		assertNotNull( dataSetHandle2 );
		List dataSetList = designHandle.getAllDataSets( );
		assertEquals( 3, dataSetList.size( ) );
		assertEquals( 0, designHandle.getVisibleDataSets( ).size( ) );
		dataSetList = libraryComposite.getAllDataSets( );