Bug 130492 Provide a method to serialize the report with library information.
Currently, when engine generate the report document file, the document does not contain any library information. That will cause many propblem on server side. Model should provide a method to serialize the report with library information to a stream so that the generated report document can contain all information that the report need.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
{
		
		
		
		if ( source.getElement( ) instanceof IOdaExtendableElementModel )
		{
			String extensionId = (String) source
					.getProperty( IOdaExtendableElementModel.EXTENSION_ID_PROP );
			destination.getElement( ).setProperty(
					IOdaExtendableElementModel.EXTENSION_ID_PROP, extensionId );
		}
		else
		if ( source.getElement( ) instanceof IExtendedItemModel )
		{
			String extensionId = (String) source
					.getProperty( IExtendedItemModel.EXTENSION_NAME_PROP );
			destination.getElement( ).setProperty(
					IExtendedItemModel.EXTENSION_NAME_PROP, extensionId );
		}
		else
		{
			assert false;
		}
	}
	/**
	 * Clone the structure list, a list value contains a list of
	 * <code>IStructure</code>.
	 * 
	 * @param list
	 *            The structure list to be cloned.