User-defined Attributes 用户定义的属性
A structured data type is a form of user-defined data type that contains a sequence of attributes, each of which has a data type.
结构化数据类型是一种用户定义的数据类型，它包含了一系列的属性，每一个属性都有一个数据类型。
System - and user-defined attributes: attributes of terms in your system, such as when a term was created or modified, by whom, and so on, are often required for managing a taxonomy.
系统和用户定义的属性：对分类法进行管理常常需要支持词汇的属性，比如创建或修改词汇的时间、创建词汇的人等等。
A location object consists of attributes such as city, state, country, postal code, user-defined location name, and time zone.
location对象包含城市、州、国家、邮政编码、用户定义的位置名和时区等属性。
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