To allow the graph to easily represent tabular data, each property may also be defined as many valued or single valued.
为了便于图方便地表示表格式数据，每个属性还可以定义为多值或单值。
The blog data object will contain a many-valued containment reference property called item, which points to a list containing the one item.
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。
A many-valued reference property will point to an SDO_DataObjectList object that will be a list of data objects.
多值引用属性指向SDO_DataObjectList对象，此对象为数据对象列表。
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