normative reference meaning in English

参考标准
规范性文献
规范性引用文件
引用标准

Of the link from rddl to the resource for example , the linked resource is for validation or is used as a normative reference
（比如链接的资源是用于验证还是作为标准参考）。 xlink所要求的
Attention is drawn to the normative references cited in this publication . use of the referenced publications is indispensable for the correct application of this publication
注意本刊引用的标准参考书目，使用这些参考刊物时必须循正确途径获得。