This example is from https://www.thymeleaf.org/doc/tutorials/2.1/usingthymeleaf.html

/*
	* =============================================================================
	*
	* Copyright (c) 2011-2016, The THYMELEAF team (http://www.thymeleaf.org)
	*
	* Licensed under the Apache License, Version 2.0 (the “License”);
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an “AS IS” BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	* =============================================================================
	*/

Entity	Number	Entity	Number
Order	1	Customer	1
Order	1	OrderLine	>=1
OrderLine	1	Product	1
Product	1	Comment	>=0