目前尚未实现metadata属性，因为这个属性对于此处实现的客户机基本功能并不重要。
The Metadata property is currently not implemented, as it is not critical to the basic function of the client being implemented here.
这种类包含用于存储和检索属性的基本功能。
Such a class contains the basic functionality for storing and retrieving properties.
实际上，标识系统的社会功能不仅仅是“路牌”的作用，它的意义远远超越了其本身的基本功能，而且具有从多角度社会层面表现新型公共空间文化属性的作用。
In fact, the meaning of sign System is largely beyond the road sign itself, and it also shows the cultural identity of new public space from different perspectives on the social dimension.
实际上，标识系统的社会功能不仅仅是“路牌”的作用，它的意义远远超越了其本身的基本功能，而且具有从多角度社会层面表现新型公共空间文化属性的作用。
In fact, the meaning of sign System is largely beyond the road sign itself, and it also shows the cultural identity of new public space from different perspectives on the social dimension.
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