Bug 188578 Add "displayColumnName" on TabularLevel
Add Property "displayColumnName" on TabbularLevel and corresponding APIs on handle. Property Type: expression.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/writer/DocumentUtilTest.java
System.out.println( os );
		assertTrue( compareFile( "DocumentUtilTest_golden_2.xml" ) );  
	}
	/**
	 * Tests the serlization of template elements.
	 * 
	 * @throws Exception
	 */
	public void testTemplate( ) throws Exception
	{
		openDesign( "TemplateElementParserTest.xml" ); 
		assertNotNull( designHandle );
		serializeDocument( );
		assertTrue( compareFile( "DocumentUtilTest_golden_3.xml" ) );  
	}
	/**
	 * when serialize report design, the embedded image from library should be
	 * copied locally.
	 * 
	 * @throws Exception
	 */
	public void testSerializeWithEmbeddedImage( ) throws Exception
	{
		String string = "TestSerializeEmbeddeImage.xml"; 
		openDesign( string );
		assertNotNull( designHandle );
		serializeDocument( );
		assertTrue( compareFile( "DocumentUtilTest_golden_4.xml" ) );  
	}
	/**