为了能够使IBM实现对不同的对象和文本信息的扩充支持，我们选择同时使用对象及其一个包含文本内容的属性来标识一个文本。
In order to allow IBM to extend support to different objects and text information, we choose to identify the text by both an object and an attribute of the object that contains the text.
这个机制容许网站扩充类型和类型的属性。
This mechanism lets websites extend types or their properties.
扩充的索引机制可以有效地支持对AD T属性的快速存取。
Fast access to ADT attributes can be effectively supported by extending index mechanism.
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