Use this field to conveniently supply a value to one of the uri attributes of an element used for xmldsig 使用此字段可以方便地為用于xmldsig的元素的某一uri屬性提供值。
While the list of children and the list of attributes operate similarly , one can contain duplicates the children of an object and one cannot the attributes of an element object 盡管子項列表和屬性列表的操作方式相似,但一個可以包含重復(fù)項(對象的子項) ,而一個不能(元素對象的屬性) 。