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/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
writer.endElement( );
			}
			writer.endElement( );
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitScriptDataSource(org.eclipse.birt.report.model.elements.ScriptDataSource)
	 */
	public void visitScriptDataSource( ScriptDataSource obj )
	{
		writer.startElement( DesignSchemaConstants.SCRIPT_DATA_SOURCE_TAG );
		super.visitScriptDataSource( obj );
		property( obj, IScriptDataSourceModel.OPEN_METHOD );
		property( obj, IScriptDataSourceModel.CLOSE_METHOD );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitExtendedDataSource(org.eclipse.birt.report.model.elements.ExtendedDataSource)
	 */
	public void visitOdaDataSource( OdaDataSource obj )
	{
		writer.startElement( DesignSchemaConstants.ODA_DATA_SOURCE_TAG );
		attribute( obj, DesignSchemaConstants.EXTENSION_ID_ATTRIB,
				IOdaExtendableElementModel.EXTENSION_ID_PROP );
		super.visitOdaDataSource( obj );
		writeOdaDesignerState( obj, IOdaDataSourceModel.DESIGNER_STATE_PROP );