POSIX 1003.1规格的一个恼人的特征是缺乏无错误值。
One annoying feature of the POSIX 1003.1 specification is the lack of a no error value.
为了使用静态页面中的portlets或者容器，包含在带有标签的spa规格指定的类属性值。
To use the portlets or containers in a static page include the class attribute values that are specified in the SPA specification with tags.
数据集内的每个属性都应该是规格化的，因此，每个值均除以该属性在数据集内的最高值与最低值间的差值。
Every attribute in the data set should be normalized, whereby each value is divided by the difference between the high value and the low value in the data set for that attribute.
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