Which item does not belong to the function of metadata? （下面哪一项不属于元数据的功能？）
选项：

A:To facilitate the retrieval of information resources （促进检索信息资源）;
B:To help identify information resources （帮助识别信息资源）;
C: To support digital preservation （支持保存数字资源）;
D:To provide domain knowledge （提供领域知识）