您还会看到我们用UML多重性[0..1]将三个属性置为可选的，如图11所示。
You can also see that we have identified three attributes as optional using UML multiplicity [0..1], as shown in Figure 11.
但是，关联的多重性经常不是任意的，而依赖于属性值，这不能用图形建模语言，例如UM l类模型来表示。
However, the multiplicity of associations often is not arbitrary, but depends on attribute values, which cannot be expressed with graphical modeling languages such as UML class models.
可跟踪性，是指一个项目的某种期望属性，说明了诸多重要信息之间的相互关系，是项目保持一定的透明度和能见度。
Traceability, is a desired property of the project where a statement is made about the transparency and visibility of important pieces of information and their interrelationships.
现在向原始的 apurchaseOrderType添加一个属性，名为purchaseOrderID、类型为 POID，原型为 «attribute»，最后将多重性设置为 0..
Now, add an attribute to the original purchaseOrderType, named purchaseOrderID, typed POID and stereotyped as «attribute», and finally, set the multiplicity to 0..
具体到每位贵族成员，有时又往往兼有多种属性，显示出生命意识的复杂性和人物的多重性格。
As to each noble member, he sometimes shows various characters, and displays the complexity of life consciousness and multiple personalities.
第五章主要写人的存在的多重属性。人是自然性、社会性、精神性、历史性（包含着能动性）相结合的矛盾的综合体。
The fifth chapter to write multiple attributes of human existence that are naturalness, social, spiritual, historic (includes activity) combined synthesis full of contradictions.
第五章主要写人的存在的多重属性。人是自然性、社会性、精神性、历史性（包含着能动性）相结合的矛盾的综合体。
The fifth chapter to write multiple attributes of human existence that are naturalness, social, spiritual, historic (includes activity) combined synthesis full of contradictions.
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