访问或技术名称描述物理数据库中的数据对象。
An access or technical name describes a data object as represented in a physical database.
用来进行单元比较的技术，如名称或操作签名，可以随着目标语言而变化。
Techniques for comparing elements, such as names or operation signatures, can vary with the target language.
如您所见，这个模式并不使用purple或orange等名称来定义元素，由于使用了扩展技术，这些名称包含在数据实例中并解析为有效值。
As you can see, the schema does not define elements with the names purple or orange, but these names were included in the data instance and parsed as valid because of the extension technique used.
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