由于任何给定元素都包含在包容它的元素的开始与结束标记之内，因此该结构必然为树型。
Since any given element is contained within the start and end tag of its containing element, the structure has to form a tree.
blog数据对象将包含一个多值包容引用属性，名为item，它指向包含一个项目的列表。
The blog data object will contain a many-valued containment reference property called item, which points to a list containing the one item.
元素包含于 元素之中，这一事实建模为从 author SDO 的姓名属性到 name SDO 的包容引用属性。
The fact that the element is contained within the element is modeled as a containment reference property from the name property of the author SDO to the name SDO.
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