这俩是干嘛的?

这俩看到出现的地方还挺多,应该是很重要的东西,不知道怎么用呢?

        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/email_v2";
        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/email_v2";
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